I had a problem back when I got my EP600v2, but the replacement amp has been going strong since then with now issues, and I really work it hard. I guess if there is no cost to you, not sure why you would not work with Axiom to get a replacment, very strange that you gone through that many amps, I see a pattern.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB SonyUBPX800