Mr Heater Portable Buddy troubleshooting

[Rexburg_rabble]

I was wondering if anyone has experience with Mr Heater's Portable Buddy. Bought one this season and was pleased with it the first couple of outings. However, the past two times I've been out with it, the flame with cut out on me after several hours of use. I have a hunch that this is a safety mechanism if the air isn't "fresh". Anyone have any experience or other thoughts? We weren't out of gas, igniter was sparking just fine.

Thanks
[signature]