Now that's interesting, I just woke up and also got my third social ban after the update.
I did talk with support before and after looking into my account they told me it's the speedhack detector doing it, and that it could be caused by connection issues, which I find pretty unlikely now since I haven't been playing laggy in a long while, so I started to investigate what could be triggering it.
Do you happen to use Mist Form? @Aorys
Do these social bans still time out after 72 hours?