I have reported the ongoing issues of repeated error messages to our ISP and raised a ticket (ie it requires action being taken). As yet I've had no response. If it's any consolation, we are experiencing exactly the same problems as you each time we try to do anything on the forum.
We have been working behind the scenes to see if there is something we could do to decrease the demand the forum places on the server - all to no avail.
An enquiry on the PHPBB forum resulted in this response
So, I think we have to sit back and wait for our ISP to sort out the issue.It's purely a host issue. If you're on a shared server you might have dozens of other sites on the same machine. One or more of the sites is pushing the total connections over the limit.
Not much you can do about that other than ask to be moved to a quieter server. Be prepared for them to suggest you pay to upgrade your hosting deal.
Sorry
Rik
