As you know, we are currently working to overhaul our PvP.net chat service. While this is an ongoing process, we recently completed an upgrade to our chat software that we believe can alleviate some of the problems that you have been experiencing in the short term.
It’s important to remember that this is only a short term fix, and that a true solution to the problem is still coming. Also, while the results of our tests make us optimistic that this be a substantial improvement, there’s no test quite like the real thing.
The maintenance will take place from 06:00 to 08:00 GMT. During this time, the PvP.net service will be online, but chat will be unavailable.
We have a contingency in place to quickly revert the changes in the event that something should go wrong, so please let us know immediately if you believe your service has actually gotten worse in some way. We’ll be watching this post and the rest of the forums like a hawk, so keep us posted!