I have the same problem with my Lexington grill. Above 300 it reaches and holds the temperature, but below that, it is variable. It is based on ambient temperature, when it is 40 degrees F I get about 215 on the 250 setting. At 20 degrees F I get about 190. During the summer it would be pretty close. I contacted Pitboss about this, and they gave me some generic BS about how clean the thermal probe is, but I tried to explain that if the probe indicated it was actual temperature, even though it wasn't, that might apply, but the probe reading is accurate, the temperature just does not reach. The feed does not adapt enough. It is a control/software problem. My solution? Replace the grill with an Oklahoma Joes. The Rider 900 I just purchased does not have temperature control for the higher temps, the control goes to 325, then there is low/medium/and high for searing or higher temps, but it is not controlled. I have never grilled above 300, except for searing, so it should not be an issue.