We have just finished a site in Umbraco 4.11.3 and moved to the live server but its throwing some weired errors intermittently.. Please see the screenshot attached,, not sure whats the problem.. searched and couldnt find a proper answer.. 

Our development environment is Windows 8 and VS 2012 it works perfectly smooth in there.. the staging server is Windows Server 2012 and there is no issues.. but the errors are happening in the live in Windows server 2008.  We have many Umbraco sites in there and never seen such problems before.