I have a Roamio OTR and the fan was making a very load noise for a few days so I unplugged the TiVo for a while and plugged it back in. I didn't hear the fan but everything worked for about a half an hour the screen went blank in the middle of a show and said searching for signal. My recorded shows and apps still work. If I plug antenna directly in to the tv it works fine. Is the fan is not working related to the signal loss? If I replace the fan will that bring back the channels or is the tuner in the TiVo bad? Thanks for any help or suggestions.