End call button not working while calling

[cismo]

hi,

on my HTC Touch the end call button does not end the call when I've been in a call for longer than 40 seconds or so. The display is still turned on, but it just won't end the call. I have to press it like 6 times, before it ends the call (usually the other side hangs up first though). When I'm in a call for 10 seconds or so, the button works right away.

The end call button seems to be working fine when I'm not in a call. I can push the green button and then the end call button and the phone jumps back and forth from the call menu to the home screen.

I had the issue on the official rom and also on a custom rom.
Does anyone know what is causing this?

Thank You