If it's shared hosting, and you have a lot of traffic, you may surely experience kind of such reply from hoster.
Then you would need a VPS or even dedicated hosting, if your forums have many users - specially "in a second" visitors.
Actually, any hoster will tell you the bad is software, not their server's configuration. I've experienced this many times in my life.
What could I recommend? Improve the hosting plan or change the hoster. miniBB uses very native requests to mySQL, they are simplified as possible. But if there are too many requests, mySQL could start to handle up, but miniBB is not the reason here. |