https://www.pcgamer.com/gta-online-players-report-multiple-unfair-bans-following-latest-update/

The GTA Online community reports multiple PC players received 30-day banning orders this weekend. The bans are said to be tied to the game's Southern San Andreas Super Sports Series update—with many players suggesting they've done nothing wrong. 

As detailed on the GTA Online subreddit, it appears tweaks to the PC version of the game's tunables have triggered a fault with its anti cheat detection system. Discord user Funnypig reports their own anti-cheat software in turn identified a lobby full of modders—including the host and Funnypig themself.