Thanks for all the replies guys.
Chris, I checked the bridge switch, not the problem.
I have also tried plugging the Amp in to a seperate wall outlet, but still have exactly the same problem. The only change in electrical devices has been the move to an LCD TV, but this has not been in use when I have problems.
I came over here from the England about 5 years ago (hence the screen name) and had the Amp converted to 110 V by Meridian. It does run a little warmer over here, but certainly not enough to make the thermal trip a problem.
I finally recieved a reply from them last Friday. "This may be a biasing issue with one of the Amplifier modules but we would need to examine the unit to determine the exact cause", so it looks like I will have to make the trip down I-75 to drop it off. Unfortunately I am working a 60 hour week at the moment, and will be for the next couple of months at least. I don't trust UPS/USPS/FEDEX, so I will have to learn to appreciate the more subtle nuances of my music collection.
I will post back with the cure when it is fixed for future reference should anyone else have a similar problem.
Furrner