Android app freezes after switching apps

Sailproof sp10s

OK, a good tablet as far as I know.

So let me summarize:
You launch qtVlm that you have just reinstalled, then you wipe from the top of the screen and press for instance home. Then you reselect qtVlm and it shows a black screen and then stops ?

I haven't tried it with home screen but i did with switching between apps. In the beginning the screen just freezed now and then, then it started turning black and crashing now and then, this afternoon it happened everytime when switching apps and now it seems to work fine again for some period. I haven't changed anything in the meantime.

Really strange, and needless to say I cannot reproduce that on any of my devices

Can you deactivate all sensors (heading, pressure, etc) just to see ?

Another question: When it crashes does Android ask you if you want to send the crash report to the developer ?