I just picked up our 09 sundance 310qb this past weekend. We went straight to a campground and stayed for 2 days. Everything seems to be working, but the fridge makes a kind of buzzing sound. It sounds like it's cutting on every hour or so and it will make a buzzing or running sound for about 10 minutes and then it stops. It seems to cooling fine, but I didn't know if it was supposed to do this or not. Does anyone know?