It happened to me only once. We had just bought our rig and was heading down to Tombstone for the weekend with a few friends. Just outside Casa Grande, AZ the engine burped and the yellow warning light came on. The engine kept running but was a little low on power. As we kept on driving I called Country Coach and they got the experts together and came to the conclusion the we experienced a sensor failure in the fuel management system. "Get to Cummins as soon as you can" they told me and they will install the update on the engine. Made it to the Cummins dealer in Tucson and they didn't have the parts so we turned around and nursed it back to Phoenix. Cummins in Phoenix fixed the problem, all under warranty and so far that is the only scare we have had. I try to do all my own maintenance and keep a close eye on potential problems, however with a complicated rig such as these motorhomes are it is a moumental task.
Note to Lil Trucker:
From the description of you post it sounds like a loose wire on the hot side to the ignition switch. The bump caused it to break connection and after some fiddeling with things contact was made again. Try checking all screws and especially the plugs that connect the harnesses together. Good luck.