A common problem this time of year is low voltage at the power pedestal, due to everyone in the RV park (or neighborhood) having his air conditioner running. This can cause power protection devices to drop the 120VAC connection, in order to protect the A/C motor(s) and other sensitive electronics on your coach.
If you have a power protection device, such as one from Progressive Industries
, I'd be checking the display to see what error might show there.
If you don't have such a device, you should get one and install it.