Could be a bad splitter, cat5 or 6 cable, Modem, bad line to the house. How many people you are sharing the line with. There are a lot of variables. Personally I'd get hold of Verizon and complain and keep complaining until it is right. I had to complain to my provider some time back and my internet has been rock solid since. Like they say "the squeaky wheel gets the grease"!