Roamio base model. Since the Summer update I have a problem with tuner 2. It repeatedly reports no signal on OTA tv channel. If I use live tv and manually tune to channel 2-1 it report searching for signal v52 and stops. pressing channel up and down a few times brings it around once. Next time the tuner is changed it again fails to find a signal. Only on tuner 2 the other 3 are working fine. This has resulted in a large number of missed recordings on this Roamio in the last week. To the point that it is very unreliable in recording anything. If the recording lands on the bad tuner, it fails. Luck of the draw. Is there anything I can do except arrange for a replacement from tivo? Not sure why the summer update would have caused this but its pretty clear from the history file when it started.