Mjwest: THis was a really old thread, but I see you posted a recent response. I sounds like you are connected to 50amp shore power and intermittently you are droppiing power on one of the 50amp legs which causes your rig to "revert" to 30amp. This appears to be confirmed by your statement of some AC items stop working, such as the TV.
I would suspect you have an intermittent connection on one of your 50amp AC supply lines. This could be at the pedestal, in your 50 amp cable, in the transfer switch, or in your AC circuit breaker box.
Problem sources could be a bad contact in your transfer switch, or a loose connection at the switch, a bad 50amp breaker, or bad connections at the breaker, or a bad connection in your 50 amp cable.
Simple trouble shooting with an AC meter should confirm where the poor, or intermittent connection is. When the power has dropped (i.e. lost AC at some devices and reverted to 30amp) then find someone that is comfortable taking the covers off the various boxes, (i.e. pedestal, transfer switch, and breaker box) and determine where the fault is.
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