This, and also, it's much more common for internet problems to be caused by upstream issues not in the house (partly because of the situation you describe....not much to go wrong on the users end). It's very rare that a plumbing problem is because the main water line lost pressure.

Back when I still had ISPs that provided the modem + router, every single issue I think I ever had fell into one of two categories: a modem and/or router power cycle fixed it, or it was a broader network issue that had nothing to do with me or my particular internet situation (this is omitting the most common third issue: terrible customer service problems, but that's a separate thing)