I just suffered the touchscreen failure problem too, after 6 months of trouble free operation with a screen protector fitted.

Initially I blamed EasyDebian, as I'd just installed it and updated it with apt. However, even after leaving the battery out for 30 minutes and booting into NitDroid the touchscreen failed to work.

I was just preparing to reflash when I remembered this thread; peeling back three-quarters of the screen protector and smoothing it down again fixed it for me. The only problem I have now is several bits of dust behind the screen protector.

Thanks everybody for documenting your experiences here and saving me rolling back to a month old backup to no avail.

11ac9, if you're getting the click & vibe your touchscreen must be working to some extent. I suspect that the screen calibration is way off, so your clicks don't press where you're aiming. I'm surprised a reflash doesn't fix that.