Bathroom Light and Fan not working

I have a 2010 Coyote.  Over the weekend, we camped and set-up went very smoothly - this was only our sixth time taking it out and this is our first camper.  On the second night of camping, something strange happened.  The bathroom light would not turn on.  I tried the fan in the bathroom, and it would not turn on either.  I also noticed that the green light on the Carbon Monoxide detector was not on.  Again, everything was functioning properly before this.  Also, everything else in the camper was fine.  Lights worked everywhere, the GF outlet in the bathroom worked, appliances worked, everything.  We were on shore power, and the 12v battery tested full when checked.  I went outside and took out the 30amp plug and moved it to another - bathroom stuff still wouldn't work.  Turned off the main breaker in the camper and back on, same thing, everything worked but what mentioned. 

the light, fan and CM/LP detector did not function the rest of the time at the campground.  However, when we returned home and my wife was cleaning out the camper, with the 12v battery still attached, she tried the bathroom light and it now functioned, the fan and detector were now functioning properly also.

I called my dealer, and KZ customer service.  They were helpful, but neither had ever experienced this before.  I can't be the first to have this issue?  Right now I'm chalking it up to something at the campground, but looking to see if I'm missing something.  Again, all other lights and stuff worked fine.

Thanks for any advice.