Heat Pump going out?
I've had worn out 30 amp pedestal connections do that. Be glad your EMS cut out before your plug contact melted the plastic from excess heat. I've seen them toasted black, cracked and distorted and the plug just falls out, they are so bad.
Good idea to have a close look at the receptacle with a strong light before you plug in. If the plug feels loose, that's also a bad sign.
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Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.