[360]

Brad,

How is the power restored?

Is the entire MW (clock too) dead?

What does your panel say for Amps when it’s on?

Any other 220v loads on at the same time?

From a distance, this sounds like a Load Management issue; especially if the power to the MW is “magically” restored after waiting a bit.

Power is automatically restored in a second or two.  Flickers just a bit and then continues on.  Microwave kicks it up to about 170A for a minute or so until it shuts off.