Since the update to 5.6.5 (which fixed the video again for me) the app now crashes regularly:

It sometimes works normally for quite some time (like 20 minutes). Then the app just disappears (I'm back the android main screen). When I reopen it it picks up where it left of (the progress is still tracked), but usually crashes after a few sec again (sometimes even before I can enter a rep number, and I have to open it 2-3 time to succeed entering the number). Then sometimes it continues to work again for some minutes. If it crashes several times in a row android displays some dialog that the app now crashed several times in a row - but that does not change anything in regards what happens when I start it again.

I did not report it immediately as I wanted to gather some information first. I've now reproduced it with "adb logcat" running. It appears that there is a segmentation fault somewhere in the renderer. I've attached the adb logcat output related to the crash.