Thank you @jumping cats! I've now been able to extract the log during the event.
But, the log is huge -- about 700MB! So, I won't post it here. But here is a snippet, from the beginning and end, and I hope with irrelevant sections removed:
Media Center; Version: 24.0.55; Types: 2147483647
0000000: 8052: General: Starting logging: Date: 29/11/2018 20:42
0000000: 8052: General: CMCPlayerApp::InitInstance: Start
0000000: 8052: General: CMCPlayerApp::InitInstance: Pre-logging time: 47 ms
0000000: 8052: General: CMCPlayerApp::InitInstance: Registering objects
0000000: 8052: General: CMCPlayerApp::InitInstance: Creating MC core
0000000: 8052: General: CMCCore::Create: Start
...
341081406: 4200: Sharing Plugins: CHTTPListenerWorker::HandleRequest: TCP: 192.168.0.92: GET:
http://192.168.0.46:52199/MCWS/v1/Playback/Info?Zone=0&Token=dFji0vZy341081406: 4200: Sharing Plugins: JRWebService::Process: Start
341081406: 4200: Sharing Plugins: JRWebService::Process: URL: /MCWS/v1/Playback/Info?Zone=0&Token=dFji0vZy
341081406: 4200: Sharing Plugins: JRWebService::Process: Finish (0 ms)
341081406: 4200: Sharing Plugins: VHTTPMessage::Write: Wrote 475 bytes
341081765: 4200: Sharing Plugins: CHTTPListenerWorker::HandleRequest: TCP: 192.168.0.92: GET:
http://192.168.0.46:52199/MCWS/v1/Playback/Playlist?Zone=0&Action=Serialize&Token=dFji0vZy341081765: 4200: Sharing Plugins: JRWebService::Process: Start
341081765: 4200: Sharing Plugins: JRWebService::Process: URL: /MCWS/v1/Playback/Playlist?Zone=0&Action=Serialize&Token=dFji0vZy
341081765: 4200: Sharing Plugins: JRWebService::Process: Finish (0 ms)
341081765: 4200: Sharing Plugins: VHTTPMessage::Write: Wrote 2195 bytes
341086171: 4200: Sharing Plugins: CHTTPListenerWorker::HandleRequest: TCP: 192.168.0.92: GET:
http://192.168.0.46:52199/MCWS/v1/File/GetInfo?File=4609&Token=dFji0vZy341086171: 4200: Sharing Plugins: JRWebService::Process: Start
341086171: 4200: Sharing Plugins: JRWebService::Process: URL: /MCWS/v1/File/GetInfo?File=4609&Token=dFji0vZy
341086171: 4200: Sharing Plugins: JRWebService::Process: Finish (0 ms)
341086171: 4200: Sharing Plugins: VHTTPMessage::Write: Wrote 789 bytes
341086937: 4200: Sharing Plugins: CHTTPListenerWorker::HandleRequest: TCP: 192.168.0.92: GET:
http://192.168.0.46:52199/MCWS/v1/Playback/Info?Zone=0&Token=dFji0vZy341086937: 4200: Sharing Plugins: JRWebService::Process: Start
341086937: 4200: Sharing Plugins: JRWebService::Process: URL: /MCWS/v1/Playback/Info?Zone=0&Token=dFji0vZy
341086937: 4200: Sharing Plugins: JRWebService::Process: Finish (0 ms)
341086937: 4200: Sharing Plugins: VHTTPMessage::Write: Wrote 475 bytes
341087015: 4200: Sharing Plugins: CHTTPListenerWorker::HandleRequest: TCP: 192.168.0.92: GET:
http://192.168.0.46:52199/MCWS/v1/Playback/Playlist?Zone=0&Action=Serialize&Token=dFji0vZy341087015: 4200: Sharing Plugins: JRWebService::Process: Start
341087015: 4200: Sharing Plugins: JRWebService::Process: URL: /MCWS/v1/Playback/Playlist?Zone=0&Action=Serialize&Token=dFji0vZy
341087015: 4200: Sharing Plugins: JRWebService::Process: Finish (0 ms)
341087015: 4200: Sharing Plugins: VHTTPMessage::Write: Wrote 2195 bytes
341087937: 2684: Sharing Plugins: CUDPSocketReader::Accept: Finish (8703 ms)
341087937: 7536: Sharing Plugins: CHTTPListenerWorker::HandleConnection: Start
341087937: 7536: Sharing Plugins: CHTTPListenerWorker::HandleRequest: UDP: 192.168.0.158: M-SEARCH:
http://239.255.255.250:1900*
341107937: 2684: Sharing Plugins: CUDPSocketReader::Accept: Finish (5734 ms)
341107937: 5568: Sharing Plugins: CHTTPListenerWorker::HandleConnection: Start
341107937: 5568: Sharing Plugins: CHTTPListenerWorker::HandleRequest: UDP: 192.168.0.158: M-SEARCH:
http://239.255.255.250:1900*
341107953: 4200: Sharing Plugins: CHTTPListenerWorker::HandleRequest: TCP: 192.168.0.92: GET:
http://192.168.0.46:52199/MCWS/v1/Playback/Info?Zone=0&Token=dFji0vZy341107953: 4200: Sharing Plugins: JRWebService::Process: Start
341107953: 4200: Sharing Plugins: JRWebService::Process: URL: /MCWS/v1/Playback/Info?Zone=0&Token=dFji0vZy
341107968: 4200: Sharing Plugins: JRWebService::Process: Finish (15 ms)
341107968: 4200: Sharing Plugins: VHTTPMessage::Write: Wrote 475 bytes
341107984: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341107984: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108031: 4200: Sharing Plugins: CHTTPListenerWorker::HandleRequest: TCP: 192.168.0.92: GET:
http://192.168.0.46:52199/MCWS/v1/Playback/Playlist?Zone=0&Action=Serialize&Token=dFji0vZy341108031: 4200: Sharing Plugins: JRWebService::Process: Start
341108031: 4200: Sharing Plugins: JRWebService::Process: URL: /MCWS/v1/Playback/Playlist?Zone=0&Action=Serialize&Token=dFji0vZy
341108031: 4200: Sharing Plugins: JRWebService::Process: Finish (0 ms)
341108031: 4200: Sharing Plugins: VHTTPMessage::Write: Wrote 2195 bytes
341108046: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108078: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108140: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108171: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108234: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108265: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108312: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108328: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108343: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108359: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108390: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108437: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108453: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108453: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108468: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108484: 5568: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108484: 5568: Sharing Plugins: CHTTPListenerWorker::HandleConnection: Finish (547 ms)
341108484: 2684: Sharing Plugins: CUDPSocketReader::Accept: Start
341108484: 2684: Sharing Plugins: CUDPSocketReader::Accept: Description: CListenerBase::CListenerBase [UDP]
341108484: 2684: Sharing Plugins: CUDPSocketReader::Accept: Finish (0 ms)
341108484: 208: Sharing Plugins: CHTTPListenerWorker::HandleConnection: Start
341108484: 208: Sharing Plugins: CHTTPListenerWorker::HandleRequest: UDP: 192.168.0.158: M-SEARCH:
http://239.255.255.250:1900*
341108500: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108515: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108562: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108625: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108656: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108718: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108750: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108796: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108812: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108843: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108875: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108937: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341108968: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341109031: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341109062: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341109109: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341109109: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341109109: 208: Sharing Plugins: VHTTPMessage::Write: Wrote 0 bytes
341109109: 208: Sharing Plugins: CHTTPListenerWorker::HandleConnection: Finish (625 ms)
341109125: 2684: Sharing Plugins: CUDPSocketReader::Accept: Start
341109125: 2684: Sharing Plugins: CUDPSocketReader::Accept: Description: CListenerBase::CListenerBase [UDP]
87468234: 2976: General: JRWebApp::Destroy: Start
87468234: 2976: General: JRWebApp::Destroy: Finish (0 ms)
87468234: 2976: General: JRWebApp::Run: Finish (87468125 ms)
87468234: 2976: General: JRWebApp::ExitInstance: Start
87468234: 2976: General: JRWebApp::ExitInstance: Stopping web engine
87468297: 2976: General: JRWebApp::ExitInstance: Stopping callback server
87468297: 2976: General: JRWebApp::ExitInstance: Stopping interface server
87468297: 2976: General: JRIpcServerThreaded::ServerStop: Start
87468297: 2976: General: JRIpcServerThreaded::ServerStop: Canceling thread
87468297: 2976: General: JRIpcServerThreaded::ServerStop: Canceling pending run
87468297: 2976: General: JRIpcServerThreaded::ServerStop: Stopping thread
87468297: 7160: General: JRIpcServerThreaded::Thread: Thread finishing (cancel: 1; errors: 1)
87468297: 7160: General: JRIpcServerThreaded::Thread: Finish (87468235 ms)
87468312: 2976: General: JRIpcServerThreaded::ServerStop: Canceling response threads
87468312: 2976: General: JRIpcServerThreaded::ServerStop: Deleting response threads
87468312: 2976: General: JRIpcServerThreaded::ServerStop: Closing notification window
87468312: 2976: General: JRIpcServerThreaded::ServerStop: Finish (15 ms)
87468312: 2976: General: JRWebApp::ExitInstance: Finishing
Media Center crashed at about 7.40pm today, which seems to align with the end of this log (I assume the number on the left is milliseconds since the log began). However, I don't see anything in this log with gives useful information. Can someone interpret this for me? Or, do I need to provide more of the log?