Using any external amp will take a huge load off the receiver and would stop the shut downs, as you are no longer using the internal amps and reducing the load created by them. The early XPA series in the past, didn't play overly well with the M80s, but that appears to have been resolved with the latest offerings.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70