You mean the in-game chat for the games you play, or the Armor Games chat at the bottom of the screen @Vietnam2016? The AG chat seems to have a hickup going on at the moment, but I'm confident this will be fixed soon!
Sorry it has been a while since I last replied... I tried to look for problems being posted for in-game chat with games, but there's no significant issues going on @Vietnam2016... as far as the Armor Games Chat goes (the one at the bottom of every page), that is running well at the moment. Did you still have problems right now/recently?