WordPress not closing MySQL connections properly

I know this problem has been repeatedly posted, but can’t seem to find any help.

I was (an am) having problems with mysql not closing connections with my previous shared host and I was booted. Now that I’m on a VPS, I’ve gotta optimise the server.

I used mysqlturner and here’s what I got (partial pasted)

[!!] Connections aborted: 28%

Your applications are not closing MySQL connections properly

Is there any way I can debug which plugin is actually causing problem, not closing connections?