I am beta testing my app through TestFlight and got a report that the user's iPhone 6+ (iOS 9.2.1) began to malfunction, e.g., mishandling touch events in other apps. This got progressively worse over the 2 days after installing my app, and then fixed after un-installing. My app does not support any background modes, stays running for about 5 minutes after going into the background. Is it at all plausible that opening my app could do something to corrupt the system? If so, what would be the likely vectors? Or, is it highly likely that this is just coincidence? Does installation of TestFlight reconfigure the system in any way that could have such effect?
I suppose your beta app could be bogarting general resources untl the OS hits the kill switch, but that seems a bit unlikely. Perhaps if you describe what your app does, exactly.