result of action taken from replys
thanks for your replys. I contacted Yamaha Tech service centre, they could not help me, I phoned a service centre and they were not helpful. I have since switched the receiver on and left it on for a few hours on a night. I have done this over a few days, now I switch it on and it retains the Radio settings. This seems to recharge the internal battery (if there is one) So I hope I have cured it.