Hiya.
The site is growing rapidly, with more visitors every day. This caused the server to be overloaded, and a fix was needed.
We moved to a new server, much more capable, so the 'server busy' situation has been resolved. At least for the time being. When it starts to happen again, we will simply add another server and double it up.
However, the move has caused loads of glitches because the forum & server setup is now different, on the new server. We are looking for the causes of these issues, which is complicated, and we hope to have several of them fixed by the end of this week.
After that, we've got some great plans for expanding and improving the site. Once we're glitch-free!