SQL 2008 connectivity error

Hello,

There are intermittent connection failure errors in one of our production SQL 2008 database server. Our database server is SQL 2008 SP2 on windows 2008 R2. The application is a resource intensive network monitoring tool that uses SQL CLR.  These connection failure errors usually occur at night. Application is working as expected.How can i get rid of these errors? This server crashed a couple of months ago with non-yielding scheduler error.The only issue we see on this database server now is deadlocks.

 Can the connectivity error be fixed by applying the windows 2008 patch? Please advice.

http://support.microsoft.com/default.aspx?scid=kb;EN-US;979149 

Error: 18056, Severity: 20, State: 29.

The client was unable to reuse a session with SPID 526, which had been reset for connection pooling. The failure ID is 29. This error may have been caused by an earlier operation failing. Check the error logs for failed operations immediately before this error message.

Error: 18456, Severity: 14, State: 46.

Login failed for user 'xyz'. Reason: Failed to open the database configured in the login object while revalidating the login on the connection.

Error: 18056, Severity: 20, State: 46.

 The client was unable to reuse a session with SPID 132, which had been reset for connection pooling. The failure ID is 46. This error may have been caused by an earlier operation failing. Check the error logs for failed operations immediately before this error message.

Appreciate your help.