[daphne]

This is going to sound off the wall maybe, but do you have trouble with any other electric/electronic devices? I've read there are a some people who have something unusual in their own 'electromagentic field', so so speak. Some have odd things happen, like their wrist watches always run too fast, and other gadgets have odd problems. I thought of that because you've had the problem with multiple devices. It might be interesting if you let someone else have the phone for a day or couple of days -- to see if the same problems would occur.