Touch digitizer failing

My faithful beta fab4 unit is still kickin' strong and video on the LCD works fine, but the touch digitizer seems to be failing. There was a touch calibration tool in the advanced menu I tried but to no avail. Using the touch interface seems hit or miss these days.

I'm fine continuing to use it as a player and just control via the web app but I'm curious if anybody has suggestions for a failing touch input or a place to get replacement parts for it.

Thanks!