I recently upgraded to Pro X 5 from pro x 3. Every now and then it just crashes for no apparent reason. I'm using windows 10 with i7 9th gen and 16GB, which is all up to date and DSP/CPU usage are fine. I'm also using a Prism Lyra 2 interface.
It also, at other times, doesn't save my plugin settings, but oddly it saves some but not others, no matter the track type sample rate etc. for example: 5 instances of the same compressor on different tracks, but 2 out of the 5 don't get saved.