I have a Roamio that I bought August 2018. OTA is almost always clear when watching live TV. Two programs get recorded from OTA signals each day: one in the morning and one in the afternoon. The recording of the morning show is always fine. The recording of the afternoon show is frequently (50% of days) pixelated beyond viewing. The weird thing is this: My wife watched the first few minutes of the program as Live TV (while it was also recording), and the quality was great, with no pixelation. However, on playback, the entire program is pixelated, including the beginning part where she saw it clearly as live TV. What could cause this?