Biztalk 2006 MSDTC Possible Issue

OS Windows 2003 64bit SP1, SQL Server 2005 SP1, BizTalk 2006

Over the past few days an error occurs which requires me to restart the 
database server which sits on a separate host to allow BizTalk Components
to 
function correctly. 

In error state:
From within the Biztalk Administrator if you refresh the group hub, it 
errors out with a SQL connection error 
From within the Biztalk Configuration Tool if you select Group you get a 
data not available error.

This all seems to point to the DB connectivity issue as the error log
below 
details. My question is the closets thing I can track this do is possible 
problems with MSDTC, and I have gone over the stpes in a article I found -

http://msdn2.microsoft.com/en-us/library/aa561924.aspx


Looking for a  root cause. Does anyone have any experience with this type
of 
problem?


A failure occurred when executing a Windows service request.
 
 Service request: Start 
 
 BizTalk host name: BizTalkServerApplication
 Windows service name: BTSSvc$BizTalkServerApplication 
 
 Additional error information:
 Error code: 0xc0c0153f
 Error source: BizTalk Server 2006
 Error description: A failure occurred when connecting to the BizTalk 
management database BizTalkMgmtDb.
 Please verify the Windows account used by the BizTalk host instance
belongs 
to a Windows group configured for the host BizTalk Group. 
 
 Additional error information:
 Error code: 0xc0c01b3d
 Error source:  
 Error description: A database failure occurred due to database
connectivity 
problems.