Hi, and thanks for sharing your review for the Pro 575/22 Grill Cover. Although it is probably safe to assume this feedback was intended for the grill itself, and not the cover, it is worth noting that the cover should never be on the grill while it is in use. As for the grill, regardless of the specific model, temperature fluctuations are always correctable with the assistance of Traeger Customer Service. If you are still having this occur, with the variance exceeding +/- 25 degrees of what the temperature is set to, please reach out to 1-800-TRAEGER before 10:00 PM MT, any day of the year, and one of our agents will be happy to help get your grill performing the way it should be.