pixelation after neighborhood network update

Our neighborhood had internet down a good part of the day close to two weeks ago. Ever since, our cable tv channels get pixelated quite often and the sound goes bad when this happens. All shows recorded have the same thing but watching from an app like netflix or prime. It happens on both of our tv boxes. I have tried disconnecting and reconnecting the cables and power cords but nothing seems to help. Any ideas how to correct this issue?