I have been having the same screenshot issues with my S4Active ever since getting it. It works like a charm about once out of every fifty times. The other 49, I can palm swipe, power+home, and dance circles around it and it won't do a thing. I have motions active, I am touching my palm (heck, just tried to recalibrate and it would not even do the test-screenshot when I did that). I have, quite literally, spent 30 minutes on a stairclimber trying to do a screenshot the entire time.
I have tried to restart the phone and re-attempt the screenshot. Same thing applies.
Any other suggestions? Is there something else that can be calibrated?
Thanks in advance.