Tivo Roamio Pro started macroblocking on all channels and all 6 tuners Friday (11/11/17) night. Signal level 72-75%, SNR 29-30 and RS Uncorrected and Corrected errors incrementing by thousands during macroblocking. Saturday morning signal came back to ok to varying to macroblocking about every 4 minutes. Intervals increased to good picture up to an hour. Then back to macroblocking for over an hour. Signal level on good picture solid at 76%, SNR still 29-30, and very few RS Corrected errors and obviously no RS Uncorrected errors; macroblocking data same as Friday night. Now (noon) stuck on macroblocking. My question is "is there any tivo circuit that could cause this?" I assume there is some distribution circuit to the tuners; could that account for this problem? Comcast comes tomorrow. I guess I want them to increase the signal to 80-99% at least. Obviously they will check my single splitter and drop and connections. Should I expect this has to be a coax connection/Comcast signal problem? Any other suggestions? Has this happened to anyone else?