The one thing I hate about my 1-year-old Weber grill is that you have to
open the main propane valve very carefully or the regulator will kick
into some sort of safety or limiter mode and the grill temperature will
never get higher than 325f.

Is this a known problem with these grills?

It there a solution - from Weber?

The grill is a Weber Genesis:

http://www.stainless-steel-grills.co..._3742301XA.jpg