You have an odd problem. I don't know a lot about your speakers, but if I'm not mistaken, they are very efficient. You should have no problem at all driving them with your Rotel. I would try 3 things to start out with. To rule out a problem with your speakers, I would try your amp on a different pair. It doesnt really matter what kind of speakers; youre just checking to see if the amp will overheat with something else. Just be sure its a speaker that your amp would normally be able to drive.
My second recommendation would be to look your amp over really well, inside and out. Take the cover off and look at all the connections. Its not that uncommon to have a soldiered connection break or go bad; especially the ones on the back for your inputs and outputs.
Third, I would get a multimeter and check the outlet you plug your amp into. There may be nothing wrong with amp. It could be an AC issue. Also, you may want to try your amp on a different outlet that is not part of the circuit you normally plug into.
You don't need to check everything in the order I put them. Do whatever is the easiest first.
My second recommendation would be to look your amp over really well, inside and out. Take the cover off and look at all the connections. Its not that uncommon to have a soldiered connection break or go bad; especially the ones on the back for your inputs and outputs.
Third, I would get a multimeter and check the outlet you plug your amp into. There may be nothing wrong with amp. It could be an AC issue. Also, you may want to try your amp on a different outlet that is not part of the circuit you normally plug into.
You don't need to check everything in the order I put them. Do whatever is the easiest first.