New (to me) 2005 Damon Challenger has been in the repair shop for a week; the generator (about 400 hours of use) will run for varying lengths of time and then abruptly shut off. When I first got the coach, the generator ran all day with both ACs working. Recently, and the reason it is in for repair, it will run for 2 hours or just 2 minutes; no rhyme or reason for the time lengths and the repair shop is as puzzled as I am. So far, they have changed the oil and filter and replaced the oil temperature plug but it still shuts off at varying intervals.