[SR-Users] mysql queries per sec forever rising...almost

Hi, I use Munin to try to understand what's going on on the server that runs Kamailio (with Siremis). One thing that puzzles me is that if I look at the MySql queries per second, it just keeps going up. The number rises during the time with calls - the more calls the more it rises - and then when there are no calls, it stays at the same level. And this is what I don't understand - when Kamailio is doing nothing, why are there 5k queries per second? Sometimes - every few weeks - it takes a steep drop to very few queries per second... - and then back to rising again. Is this a database issue, a Siremis issue, or a Munin issue? Or is it just something I don't understand that it's supposed to keep rising forever? Thanks! //Anders