my new bk princess is doing great except for for a problem with thermostat adjustment. Sometime the adjustment knob will not stay where it has been set. If I open and close the door or the bypass the thermostat will drift to a new setting. It does not have enough friction to keep it in one place. My solution is to bend a plastic tooth pick in the middle and slide it between the knob and the housing. That provides enough friction to keep it where it has been set. has anyone else had this problem and is there a better way of fixing it. The dealer has not returned my call.