I did a quick search for this and didn't find results, so I'm thinking its just as bizarre as I thought.
MY internet went down last night, and after 20 minutes of unstable it was back. But out of curiosity I decided to login in to my router and take a look, and perhaps force a reboot if necessary. When I tried, it told me the credentials were invalid (even though I was in there last week), and after numerous attempts, I sent an email to my ISP admin.
He wrote me back saying he had accessed my home router remotely to do some updates and he had changed the user/pw because "there really isn’t much in there that anyone would need to change other than myself".
I pointed out that he has taken away my ability to allow/disallow firewall programs, use port forwarding and manage my network, essentially. I have not gotten an answer or resolution yet.
Anyone else heard of an ISP locking you out of your own router? Could it be because its their equipment? This is a home network we're talking about. A little AirOS router for my family, not the broadband router at the tower.
I realize its his router and he can do whatever he pleases, but is this something you've seen or dealt with before?