Have you restarted your internet router at any point? You may have picked up a banned IP or something
i will send a gyazo https://gyazo.com/86299d1a346adedd67c9553682377396 if you could ask a ts admin to check
That's a strange one, try connecting to another server, don't name it here but tell me if you can get onto any other servers
The only thing I could suggest is to reinstall teamspeak or maybe create a new identity, if you do, any tags you have will probably go but you can ask a mentor for them back