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Just a WAG, but if your gen running results in all coach systems functioning normally then the suspect is the shore power itself; your EMS monitoring of the shore power is cutting off AC due to some brown out or other "bad" condition it senses; or the transfer switch from the shore AC side has developed a poor or intermittant connection perhaps?
My EMS (Progressive Industries) allows a bypass of the unit (risky if there is some serious problem), but if you deload a few AC loads in the coach and bypass the EMS you might find all is normal again. This happened to me in a campground that was suffering from brownout conditions (AC source voltage dropping below spec) so the EMS would cut out to protect air conditioner etc.
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