My X10 has started to behave strangely. A couple of days ago we noticed that some lights were not switching on or off while others were coming on at strange times. We then got woken up the other night by one light in the bedroom coming on at 3am...

I spent some time trying to locate the problem yesterday and am even more confused now. One set of lamps will only turn on/off if I disconnect my Squeezebox receiver - although it's been all working fine together for 4 months now. My HomeVision unit is showing me that the X10 signals are being sent and received but some lights are not getting the signal. It seems to be lamps rather than ceiling lights. It's almost as if there is something causing noise on part of the mains.

Anyone got any ideas or recommendations for things to try.