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E+PLC 100 touch screen and switch behaviour

I have several touch screen pads mapped to normally-open switches in a ladder diagram program. Usually everything works properly, but occasionally when a touch screen pad is pressed it somehow changes the action of the corresponding switch from normally-open to normally-closed. The problem seems more likely to occur the first time the program is downloaded to the PLC after power-up. Can you suggest ways to trouble-shoot the issue?
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