I would expect it to run for 10 minutes once every month or two and maybe make sure average fuel age is less than 1 year (essentially what the Volt does). I think what could help with the Clarity is if the car said why the engine is running. I think they wanted to make it like a normal car, so it doesn't advertise any of that, but these random starts seem odd to me. Bob, you have let it run at least 10 minutes continuous after the engine starts, right? My wife hasn't seen any of these random starts in 8,500 miles, but uses the engine weekly for at least 30 to 60 minutes. If your engine has gotten good and warm, it really sounds like some sort of bug or issue that needs to be worked out with Honda. Hopefully they can get an engineer involved, otherwise it probably won't go anywhere.