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I am not sure, if this is your case, but might be well known "feature" of M92.
If you leave a pen for certain (relatively short) time touching or close to screen and pen does not move it stops responding. The only way to make it respond again is to displace it from screen.
Someone described that it may be related to power management of M92. If pen idles for some time it is "hibernated" and the only way to make it wake-up is to place it off-screen.
I cannot say if this is a bug or design feature. If you know what leads to the state, you may avoid it. And if not successfull one knows what makes it work again...
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