On Sep 1, 2016, Ignoramus27222 wrote
(in ):

I had a similar problem, the flame would start out very small but
increase as the grill heated. Changed the regulator and everything
became fine.

The old one was full of crud and oxidation.

I didnt notice an increase while heating, but I would start the grill and
come back in 10 to 15 minutes, so I would not have necessarily seen any
increase. But accumulation of crud and oxidation is certainly plausible.

I will cut the regulator apart and inspect the innards.

Joe Gwinn