Be careful when traveling through the lands of Tamriel. According to a growing number of reports on the official Elder Scrolls forums as well as third party websites, players are experiencing situations where their character is either falling through geometry or being catapulted off of the world and into the abyss below. I personally experienced the bug on the fourth when I jumped into the queen and was thrown completely off of the map (pictured below). It looks as though Zenimax has implemented some sort of anti-cheat measures since then to prevent exploitation, because players are reporting that falling through the world will now result in a disconnection from the server and automatic suspension of one’s account.
If you are caught by this system, the only thing you can do is to contact support and appeal the ban.
MMO Fallout 
I don’t know about them but I’ve fallen through at least a dozen times, probably a lot more. 4 times yesterday and havne’t been banned. Personally I think a few of those people complaining are ones that abused the guild bank exploit