My radio is becoming somewhat of a major irritant and having searched around, I can't seem to find anyone who has experienced a similar problem.

Effectively, the radio is fine but as I'm driving around every so often the volume almost goes to nothing for a second or so, but then goes back to normal.

Playing CD's is fine but I can't fathom what's wrong with this radio. I've checked connections to the Radio module in the boot and all seem fine.

The car is a 2003 53 4.6iS with Nav, Bluetooth, Radio and CD Multichanger.

I'm in the UK and don't have any traffic alerts switched on.

I hope it's not the radio module as these appear to cost a small fortune.

Any advice would be gratefully received.