Messages Are Not Being Seen

For some reason, my messages are not being seen and sometimes I am not seeing my friends messages. It started a couple months ago in our private ls and it would only happen maybe once a week but as of late it happens maybe a few times a night and has even spread to fc chat. I have submitted dozens of bug reports about this but it is only getting worse and worse. I tried contacting support and they sent me here so hopefully this is resolved soon. I have needed backup numerous times in dungeons when someone will leave and I can't get it. I tried retyping the messages, using history and every other method I could think of. Last night it even started effecting the emotes for some reason. Please, can someone tell me what is causing this bug or if there is any way around it. We are really getting sick of it. We've been dealing with it for almost 3 months now.