database mirroring issue with MSSQL 2005 SP1 on 2003 64 bit

we are experiencing a problem in database mirroring with MSSQL 2005 64 bit SP1 .

we have the following setup in HA mode with principal, mirror and a Witness .

The issue occurs in the step6

1.      Initially was Principal and was Mirror.
2.      First was powered off.  . Fail-over was proper and output files were observed for 20 mins.
3.      After that was powered back on, and became the Principal.
4.      Next was powered off.
5.      correct output  resumed after that.
6.      But after some times, the status of the database server became Principal/Disconnected/Recovery and output files again became of wrong size.
7.      In the SQL server logs of it was mentioned that the connection to Witness was lost after 50 secs (The configured timeout period).
8.      There was no visible connection loss between the database server and the witness.

9.      These tests were repeated number of times and the pattern of the results was the same.

Please help.

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Vitor MontalvãoMSSQL Senior EngineerCommented:
Looks like it's network problem but anyway you should install SQL Server 2005 SP3 because could be some known bug that was already fixed.

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EugeneZ ZhitomirskySQL SERVER EXPERTCommented:
check sql servers sq error logs and event viewer related errors on all mirror servers (principal \mirror)
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