I purchased an x4000 a few months ago and lately I've had problems with the source input changing itself at apparently random times. This is independent of the source that is being used at the time, and independent of cables that are being used as I've changed them and have the same results. I will be using the DVD input and it will switch itself to CBL/SAT (despite there being nothing connected to that input), and if I simply plug what I'm using into the CBL/SAT input then it will switch itself to PHONO (with nothing connected into phono). This does not happen often, but enough to be very annoying. I did a hard reset in the receiver and this did not help. Also checked the batteries in the remote and they are brand new with full charge reading on a multimeter. Any ideas? Thanks.