HP15C LE Bad Button Presses

[BobVA]

Thomas Radtke suggested in this thread

Thomas Radtke Wrote:The real problem is the hard coded key time-out value. I suspect every 15C LE will once in a while (every couple of hundred keypresses or so) show double registered entries. They appear real fast, so that a slightly higher value would have eliminated this problem

...but if it's getting worse there may be another issue? If it's not mechanical wear on the keyboard - which you'd think wouldn't affect random keys - the only other variable I can think of is lower battery voltage, so perhaps try changing the batteries for fresh ones?