First I thought it has to do with my older Joying unit but now I installed the same packet also on the brand new Pumpkin ( Android 9 ) : same problem..
I thought maybe it has to do with the sys.txt or something.
Only thing I have to do is close and launch directly again and it keeps working fine for the rest of the day.
Maybe something to do with the unit going into deep sleep ?
But strange that no one else has this ?