Phone freezing/screen unresponsive
Over the last few days I've had problems with extreme lag on my I9505, and several cases where the screen is completely unresponsive. Pressing the hard buttons (power/home) generally gets a response, but tapping on the screen doesn't. Only a cold reboot fixes it. What's the best way of diagnosing this?
I'm running Phoenix ROM v7.3 (which is based on stock Android 4.3).