Simple in that only stabilization and fast forward effects are used. The one hour long project actually crashed after all the work was done and FCPX was sitting idle. The other projects range between 5 and 15 minutes, which is still a lot of processing. Individual clips are generally ~2-3 minutes. During the same period I also have done dozens of one hour projects without issue. These only have cuts, blurs, and some transcode. I can run handbrake for hours at full speed (~1500% CPU indicated by activity monitor) without issue, also compressor. Its just FCPX that seems to crash. FCPX may be the only one that uses the GPU as a helper.
The source video is imported to a library on a 1TB thunderbolt SSD (samsung pro), the only thing on that drive, maybe 70% free. The internal 1TB storage is also about 70% free.
I was thinking perhaps a hardware or GPU failure as was discussed on the MacRumors forum, but the GPU is not reseting in all cases. Before I go off and run the diagnostics test, or reload the OS, I wanted to check if others are seeing the same thing. FCPX seemed to work fine under 10.11.5, rarely an issue. Perhaps I'll try putting the library on another drive.... or just live with it.
