Chat Restrictions

For the past few months i have been experiencing problems with the chat in champ select. There have been multiple occurrences during champ select where i have been unable to call a role because of this. I don't have any screenshots of this, but it does happen a few times a day while trying to play a game. It doesn't bother me too much but it does get irritating sometimes when I'm having a bad day and just would like to play something I can have fun with