Actually, if the touch isn't calibrated correctly, it could and does lock up.

So do this:

Turn unit off.

Hold the flag button (and Keep holding) as you turn power on the unit.

The unit will got to a calibrate screen.

On this page you will see a cross hair. At this time, release the flag button.

Touch the cross hair as it moves about the screen. There are 9 points in the cross hair calibrate routine.

When you are finished, the unit will automatically revert to normal operation.

Try this. Prob fix your lockup problem.

PS

Don't rush the process. Let it do it's thang. Takes a short time.