My server provider is telling me that we have a lot of MySQL connections opening but not closing. This problem started when one of our larger sites went over to WordPress, so my conclusion is that there's something not right here. It also swamped the server's memory daily, which I think got back under control with the marvelous WP-cache2-plugin.
Still, a lot of unclosed MySQL connections doesn't feel all that stable and I'm afraid that I'll have to reboot daily just to flush out the memory.
Has anyone else had this problem? Any ideas?