I asked my friend to not play Corki.

Last night my friend and I were duo queuing in Team Builder. He chose Corki. I played Master Yi jungle. During the course of the game (I noticed it after about 10 minutes in) Corki's siren noise became unbearably loud and obnoxious.

This may come across as "hating" or "complaining". I assure you it is neither.

The effect was global. It didn't matter where I was on the map.

It happened about every 10-15 seconds.

I asked my friend not to play Corki.

If this has happened to you please let Riot know so they have sufficient reason to investigate.