It's strange that it's happening on a non-Samsung device... It's my understanding that Ren'Py currently has a known issue with newer Android phones, but I thought it was a Samsung-specific issue. Hopefully Ren'Py is updated to fix the issue soon, because I'm not sure if there's anything I can do on my end to fix the issue faster. I may need to just rebuild the Demo v5 APK once the issue is fixed in Ren'Py...