If it freezes again, please make some process snapshots and send them to us:
I would also recommend avoiding MTP entirely, if that is an option, as it has never been very reliable and has long has problems at both the Windows and device ends, whether Opus is involved or not. (I've found it unreliable with File Explorer as well, and it does things like completely freezing it two things try to access the device in parallel sometimes.) Plus it requires a cable instead of working over wifi, which usually only makes sense if you're limited to slow wifi.