[bobturismo]

I would think that it's really easy to see if the end button is some how physically sticking or software sticking.

Goto: Settings/Personal/Buttons

At the bottom select = Long Press End Key ((You may have to hit the little right arrow to see it)

There you should be able to change it from "Turn Airplane Mode on/off" to whatever you like.

I would probably recommend "Set Vibrate/Ringer" that way if it is a function of the button, then when it vibrates, you know that it's the button (physically or software wise).