Just a follow up, my Tablo was downgraded to 2.2.18 and I am still having pixelation issues.
So basically, this is not a firmware problem. I'm having this problem since the first week-end of june.
Maybe something in the way between the tower and my antenna. The problem is worst with the Tablo 4 tuners than directly in my TV Tuner, do you thing I should use an in-line preamp (signal strength is between 85% and 100% for all my channels).
But the problem is worst with channel 8.1 (TVA) that is VHF. The other channels are all UHF, maybe something I could add to my setup to help VHF channels (some filter, I don't know)?
Thanks to all!