Mine was doing this same thing. My wife's was not so I figured it was my phone. I did a factory data reset and that didn't fix it. Went to Verizon on the 15th to trade it out and.......New one was doing this same thing. Turns out there's a problem if you have triple tap on (where you tap the screen 3 times to zoom in) and try to use the pen. I turned that off and it works great now. I haven't called Samsung yet to inform them of this problem.
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