There's no error message from the OS of any kind? That is very bizarre. The crash reporting on Windows is something the OS does. It is like something is killing MC's process externally, or it is being intentionally closed (though not via any normal means).
Sure you don't have any remote controls or automation scripts run amok?
In the most recent of your logs (logging start 3/06/2015 10:51 am, I assume a European-style date), the last thing the main thread (4200) was doing was:
* Starting up a playback thread (3512) at 0779412.
* Downloading/checking for Podcasts at 0786728, which appears to finish normally.
The playback thread ran till 0805729 (26.3 seconds). Then the log just
stops. It doesn't even shut down, it just stops. No crash is shown (not surprising, considering no OS crash dialog comes up), no crash dump, nothing. Just stops executing, as though killed in Task Manager or Process Explorer.
It could be a GPU or other hardware hault (overheating CPU, bad RAM), but I don't have much to go on.
In any case, do the uninstall/reinstall and make sure to use the latest build (20.0.115, pinned in a post at the top of this board). If that doesn't help, disable auto-import and let us know if you see any changes. You can check to see if background processes are running via the Reporter (instructions in
Troubleshooting Background Tools, linked in the Troubleshooting Guide under the Background Tools section), but that typically applies more to hangs and poor performance, than this kind of thing. Auto-import could be a culprit (sudden, non-correlated to playback, crashes are often due to a corrupt file in a Watched directory), but... I don't see Auto-Import doing anything in your logs, and it doesn't look like a normal crash.
Still, I can't say I've seen too much of this kind of thing, so... ?