Opened MySQL connections on vB 3.8.4

[fresset]

Hello there,
I have a problem in my vB installation which creates connections that won't close.

Let me explain. I log in into phpmyadmin and run "show status like '%conn%';" and see 800.000 connections. After 1 minute, these connections may be 801.000, and so on.

My host found an attack before some days and restarted MySQL, so this number started from 0 and now, after 6 days this number is 800.000+.

My host told me that there are somewhere code lines that open a connection with MySQL and they never close it.
I have about 5.000 php files in forum's installation and I have no idea how to check this.

Sorry for my english. I wish I explained the situation properly.

Thank you