Barry,
Good idea, I dont (yet) have have any cordless phones, and I am a good 100m from the nearest other house so dont think thats it. I just turned my Philips video transmitter off but makes no difference. (VL1202)

I have had a response from Philips tech support, they think I have a faulty ipronto or ipronto network card.

It will be interesting as I am in the UK and I used BlueDo in the US. I am sure they will look after me fine.