I live in zip 77381 Houston and have had great reception until about a week ago when I started getting a lot of pixelating on my local hd channels, NBC, ABC, CBS, FOX ect. I have signal strength in the upper 90s on the 103(b) but 49 and 50 on the 103(a) directv said it's normal for lows on that side. All other sats have good signal , and picture in good except the local hds. This is happening on both my HR20-700 and my h20. Seems to happen in the morning and thru the day, but goes away about 10 pm. Whats this about?