I have a Mits 52725 that is about 3 months old and recently every few days it displays a message that says "the tv will turn off in a few seconds, please check to see if anything is blocking the filter door" then the tv turns off. When you turn it back on it works find. The message that is displayed on the tv as I stated above may not be exactly as I quoted but it is close. The filter cover seems to be find and air is flowing through it. Has this happened to anyone? Any suggestions?