I bought a new PH and installed last week of November. Huge improvement over our old VC Encore. Everything has been working beautifully so far, except for my draft control lever. When to stove is cool , the lever moves nice and easy. The warmer the stove gets, the more difficult it is to move (especially close). Above 450 stove top temps I have to apply so much pressure I'm afraid I may bend/break something. Any other PH owners experience this?