Xibo does not end db connections

After a restart of the web server and the mysql server, the web server does not end the db connections, so, any new connection is stablished until apache reachs the workers limit stops receiving connections from the androids. To end the connections between the database and the web server we need to restart apache. The thing is that this happens every 10 minutes, so it’s not managable.
Is there any further configuration missing that can provoke this behavior?

Thanks in advance,

What type of installation are you using?