2800 Onan lpg generator issue

We have a 2012 Road Trek Adventurous RS purchased 6 weeks ago. It has a 2800 lpg Onan generator. A few days ago the generator started on its own. I could shut it off by holding the switch to stop. Regardless of how long I held it there when I released it the generator restarted. Replaced the switch and same problem. Any ideas??