Error 318 can be triggered if there is a significant response delay between performing a high number of actions and the server processing them. The 'spam' while unintentional is just the server being hit with a lot of requests at once.

That's happened to me twice in the past week, even though I haven't been posting on Chat. Yeah, it's a weird error.

Yeah, I get the warning message often just when switching gear around.

Console users get this too...

happens every time i pull all my items from 5 guild stores and then go to relist them.

i get booted from server and have to wait 15 minutes to be able to log back in. its total garbage.

I don't know if it's add-ons, but I only have two add-ons: Map Pins and Dolgubon's Lazy Writ Creator. So ... maybe one of those? Although Sassparella said It was happening to them on Xbox One (no add-ons).

This has nothing to do with chat messages or email messages or anything like that. It is related to data messages going between your client and the server. So if you are having lag and start bashing keys in frustration, all those key strokes may go off at once once the lag gets better. And the server says, "Hey, I just got 47 keystrokes in 1 second. No one is that fast. Somebody is using a hack or macro. I am going to kick them." Some addons that perform automated actions like changing gear or skill bar setup can also do this if they perform too many actions too quickly or if there is lag and the actions build up on your side and then go out all at once.

It is annoying that valid actions can sometimes trigger this, but if it was not in place it would make life even easier for bots and hackers and exploiters.