Comment by jeiebx83

I ran into a similar issue, except internet and phone would get really bad on a cold morning.

Tech showed up around noon, saw I was indeed having a bad connection, went and checked the signal at the junction box for the street (can't remember what you call these) and everything was normal there, so he closed it back up again and double checks the signal at the house again, but it was fine. He walks the lines to double check but everything looked normal.

His best guess was that moisture was condensing ever so slightly inside the junction box that morning, and was let out as soon as he opened it at around noon, which fixed the problem.