I can see some crashes relating to the intel graphics hardware - see this post and I suspect your problem to be intel drivers
I will check other crashes - in case they are not only due to hardware transcoding.
The post I am linking gives two reasons for the crashes - the 3rd is already fixed. The two remaining are if running the Plex Media Server headless / as service or through RDP and the other which is likely your issue - is intel driver version - the post shows a matrix of versions seen to crash in the intel driver
