well i don't think its as fatal as you imaginge, it seems that the system shuts it self off, on the flip side, im not even at full volume, It will do it at -25dbs, shure its pretty damn loud, but I still wish it was louder.
but if you are thinking that it isn't aheat problem then is there any solution? and if it helps any it is a dual amp reciever, meaning it has a set B speakers, I think that the b speakers might have been affecting the independence even though they were not selceted to be on they made a nosie when the receiver powered up.