On this range of machines, I must just be unlucky, but most of the time for me its not actually been the touch panel itself, but the little board it plugs into on the left hand side of the control panel. New touch panels did not fix the issue, only the board did. It was particularly prevailent in environments where the carpet causes you to discharge static electricity every 3 steps. The panel is grounded so it shouldnt be that, but clearly it was..
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