When I attempt to render a one camera video (25 minutes long) from xavc to MP4 format, the render dialog box appears for less than a second, then disappears. After that the program is locked and will not respond to any commands (close, play timeline, etc). Also, when I attempt to open Task Manager, it shows an icon in the bottom bar, but will NOT show the dialog box. Keep in mind that the "GPU for accelerated video processing" is turned off in 'preferences', as required to keep the program from crashing every couple of minutes.
I7 7820. x299 gaming pro, GTX1080, 32ram, windows 10