I have just built a VRF smoker and using a BBQ side burner for heat with cast iron pan. Problem I am having is the flame just keeps getting lower over time. I can have it run maybe an hour before flame gets too low and then goes out. I have switched bottles but I suspect the regulator is flaky. The good news is the wood chunks keep the cook box temp from dropping temp too much when it goes out but it is a pain in the toosh. Comments - suggestions appreciated appreciated.