I'm having trouble logging into my account.

Hello, for 3 days I can't enter the game. Writes to me "Could not log in to World of Warcrat at this time. please try aggen later.". In my profile on the site it is not written anywhere that I have been banned or punished for something. I have not used a VPN. The only thing I noticed is that my IP is dynamic and that might be the problem.
I restarted it, logged into the site with the account, tried again in the game and it doesn't work.
Any idea what else I can do? I guess that was my adventures on this server.
Thanks to help.

I tried restarting the router several times. But nothing happened. I did a hard reset on the router, it went back to factory settings. I fixed it and it still shows the same problem. I tried to download the game again, it still shows this problem with locking the acc.