Really strange Ban

So i just got a 2 week ban for apparently nothing...

No email.

No client message.

Nothing.

Is this a common occurrence in league to get random Ban for no reason. I cant even honestly imagine why i would. I dont talk in game, never a reason to. except a couple needed in game infos. I have only afk'd once because my client bugged out and it took me like 10-15min to get back in after rebooting my pc. then i continued playing.

Is there ban bug going on?