It happened twice without an apparent connection, when I receive a call, the touchscreen is unresponsive and I can't take the call. The display is not frozen, because I can still see the call dropping and the physical buttons still work (volume, for example). But I cannot reboot the device, because I can't touch the selection "airplane/reboot/shutdown". I have to unplug the battery. Then everything comes back to normal.
Any ideas how to prevent this or how to unfreeze the touchscreen?
Any ideas how to prevent this or how to unfreeze the touchscreen?