Can you please open the error log and post the startup messages (the first 20 or so messages from the log)? You can remove the server names and database names.
I'm 95% certain as to why this is happening, but need the error log to confirm.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability