I've had some pretty strange things happen with my 4500, but this weekend it seemed fine. Once, it started calling the last number dialed(my home phone) repeatedly. I was trying to get to sleep when the phone kept ringing every five minutes and there was nobody on the other end. After the 5th time I happened to look in the direction of my cell phone and noticed it was lit up, went over there and it was calling my house. Must have been a bug in the sprint computers or something, never has done it since.