PDA touch-screen failure at 8000 feet?

I use my Sony Clie TJ37 a lot, but rarely while flying. The other day I tried to use it at 8000 feet and the
touch screen was very unresponsive. I could *sometimes* get a click to register but I had to press very hard
or "whack" it with the stylus. Back on the ground it works fine. Anybody have any similar experience, either
GA or airline (cabin alt== 8000 feet)?

I have heard of bad effects of altitude on hard disks, but it's hard to imagine such an effect on a touch
screen!
--
Cheers,
John Clonts
Temple, Texas
N7NZ