Android “Bad Frame Quality” error when closing & reopening app

On an Android build using Unity 2018.2.18f1 everything works fine, but when I close the app and then reopen it after a while the "UPDATE ERROR BAD FRAME QUALITY Low-frame quality has been continuously observed" error is there. Tapping close dismisses it and everything works fine again, but this happens every time the app gets "minimized" for a bit and then reopened.