Also look at changing the channel on the router. Had one running great but after a couple of years, connecting was iffy. Turned out there were 4 times as many local wireless signals than I remembered when I set it up. Looked up how to change the channel at the manufacturer’s website and it recommended two other channels ( plus the default. ) Still didn’t fix it. I then decided to change to a channel not on their list. No connection or speed problems for years since then. Looks like most use the default channel.
Yep and they don't change the password either.