Omeka Classic sometimes site won't load

I installed Omeka classic ver.3.0.2 to a server and i transfered content from another omeka installation with api.
Then i worked the new installation to complete the project.
My problem is that sometimes the site won’t load. Other times loads with very good speed. I might work in it for ten minutes and then stops to load any page for 2 minutes. I already talk to hosting but they dont see enything bad.
Then i installed Wordpress to the same server and domain but another path. I noticed that when omeka won’t load Wordpress loads.
So i asume that the problem might be some setting in omeka installations??
Please Help me
Thanks in advanced

OK it was server’s fault