wsxt1

The Motorhome in question is a 2008 Holiday Rambler Admiral, 36 ft, Gas

Lately, while plugged into shore power, I'll be reading with the lights on, etc. and everything will go dark. I thought at first that the site had a problem but all the other coaches had power. I checked my shore power and everything was OK there. After a brief period I flicked my battery switch by the door and everything came back on. This has happened several times recently and is periodic. Any ideas?