I'm using Tubex and tradeexpert.
I got this message:
From this point, the following options are available:
1) Block heavy users of your site, if any, that may be causing excessive load within 24 hours.
2) Optimize scripts (php, etc) that may be consuming a large amount of CPU or RAM within 24 hours
3) Upgrade to a Managed Dedicated server; your site may have outgrown a shared environment. Within 24 hours
4)
Seek service from another provider within 24 hours.
I have another site with the same traffic, with the same scripts in
http://interserver.net and never had problems.
The problem is certifiedhosting, they only support small sites.