Does it only happen when playback is active?
If you let it run idle, does it freeze by itself? How about if you use MC to do other stuff (tagging, etc) but have no playback active, does it work fine?
If it is generally only happening during playback or disk access, I'd look at:
- Disk issues (filesystem issues on the media disk, or trouble generally with the SATA or USB drivers)
- Anti-virus
- Audio or GPU (video) drivers
If it happens all the time, whether playback is active or not, then we could look at other solutions. Possibly a corrupt media file in your Auto-Import Watched Directories, or maybe just needing to be completely uninstalled/reinstalled (if there is some other corruption in the install directory or registry entries).