Electrocompaniet EW-75 question

I just got this aw75 to drive my Thiel 3.5'sI listen to rock/metal mostly.My room is 20x14x8I play it loud but still have decent headroom.I have not sent it into clipping or even a hint of strain.This combo does not play real loud to begin with.When I push it to its max but still below clipping the amp shuts down.No warning,no noise,nothing.It just turns off very politely.After 2 minutes the light in the power switch clicks back on and the red light comes back on and then all is well.This happens everytime I push it.I have the EC-75 owners manual and there is no mention of a thermal overload protectant circuit in the amp.Here's another grmlin...At times the right channell breaks up and will cut out.When this happens the amp shuts down.