Surge Guard Cutting Shore Power Off?

[Surge Guard Cutting Shore Power Off?]

I understand a short lifespan... but heck.... the RV is 6 months old!  Although we are living in it so maybe that speeds up the death of parts? 

I've got an appt. at Rev Group for January and hope we can hold off until then. 

[Surge Guard Cutting Shore Power Off?]

I'm having an issue with shore power shutting off randomly, a few times per day.
We just arrived at a new park yesterday and it started shortly after we got plugged in.

I should mention I have a portable "surge guard" plugged in between shore power plug and my cord. That surge guard shows all green lights, even as shore power in the RV cuts out.

After some google research I "think" it may be my surge guard / ATS. I have a 2017 Fleetwood Pace Arrow 36U. The surge guard / ATS is a Surge Guard Model 40350 RVC Automatic Transfer Switch.

Background: There appeared to be intermittent loud humming from the area of the ATS in the recent past. It doesn't seem to be "humming" anymore.... just making a fairly loud "clunk" as it shuts off interior shore power, and then later (random amount of time each time) it makes the same "clunk" when interior shore power comes back on.

It has done it with very little load. No A/C or heater on... maybe pulling about 3 to 4 amps. Since it is so recent I don't know if it will also do it under load.
Speaking of "load". Back when it was "buzzing" it appeared the buzzing pulled a load. Nothing on except for maybe the fridge and it would jump from 3 or 4 amps to 11-12 when the buzzing started.

I should also mention it seems if I cut the breaker at the shore power tower off then back on, the shore power in the RV return

I have an appointment to bring it into the shop in mid-January..... just don't know if this a big enough issue to worry about right now. We are full time and travel / move frequently. (about every week)