We just returned from a 4 week trip and in the last 2 weeks, every time I disconnected the trailer from the shore power, the trailer tripped a "master" switch under the drivers side bed and there is no DC power available in the trailer. I am able to reset the switch by pressing a small lever on the switch. I had the same problem last year but a local RV shop could not find anything wrong with the system. I am not an electrician but it seems that the AC to DC converter is not working. Has anyone else had this or a similar problem, and if so, how did you fix it?