Electrical issue

I have a 2007 Damon Tuscany 4072. I am losing electrical power often, AC will go off, carryout satellite goes off, convection over clock blinks until reset. In other words everything on shore power goes out. However within 5 seconds the power comes back on.
Today i replaced the IOTA ATS and i still have the problem. No circuit breakers trip. I had the electrical pedestal checked all looks good there.

Any ideas of a cause?

Thank you!!!