We have an Altalink running the (current) latest version of software.
The button pushes on the touch screen are erratic, you can see the button going down and it makes the sound but it doesn't do anything.
Can the touch screen be calibrated?
We have 3 machines doing this in two different locations, so I wouldn't think the power source would be the issue.
Altalink doesn't have touchscreen calibration and you may need to contact Xerox Support Centre.