The other night the picture would freeze off and on, I thought it was rain fad at first as there was a strong storm semi-close. It did this for a while then the screen went grey. I reset the receiver and it stuck on the self test screen. I unplugged it and plugged it in again and started making a horrible noise (hard drive?) until I unplugged it again. I decided to clean it and used air to blow the receiver out. There was not a lot of dust from it and it has plenty of circulation around it. It has been working fine for now going on a full day. Is this a sign of a failure soon?