Cluster problems?

Every now and then (about once a week) our SQL server cluster
(active/passive) becomes unresponsive, and the following events are logged:
Type: Error
Event ID: 17052
Source: MSSQLSERVER
User: N/A
Generated: 8/7/2005 7:58:33 AM
Category: Failover
Message: [sqsrvres] CheckQueryProcessorAlive: sqlexecdirect failed
Data: 9C 42 00 40 01 00 00 00 0B 00 00 00 44 00 41 00 54 00 41 00 42 00 41
00 53 00 45 00 30 00 31 00 00 00 00 00 00 00
Type: Error
Event ID: 17052
Source: MSSQLSERVER
User: N/A
Generated: 8/7/2005 7:58:33 AM
Category: Failover
Message: [sqsrvres] printODBCError: sqlstate = HYT00; native error = 0;
message = [Microsoft][ODBC SQL Server Driver]Timeout expired
Data: 9C 42 00 40 01 00 00 00 0B 00 00 00 44 00 41 00 54 00 41 00 42 00 41
00 53 00 45 00 30 00 31 00 00 00 00 00 00 00
Type: Error
Event ID: 17052
Source: MSSQLSERVER
User: N/A
Generated: 8/7/2005 7:58:33 AM
Category: Failover
Message: [sqsrvres] OnlineThread: QP is not online.
Data: 9C 42 00 40 01 00 00 00 0B 00 00 00 44 00 41 00 54 00 41 00 42 00 41
00 53 00 45 00 30 00 31 00 00 00 00 00 00 00
SQL server errorlog contains these errors:
2005-08-07 07:52:16 - ! [165] ODBC Error: 0, Timeout expired [SQLSTATE HYT00]
2005-08-07 07:52:16 - ! [382] Logon to server '(local)' failed (JobManager)
2005-08-07 07:52:19 - ! [165] ODBC Error: 0, Timeout expired [SQLSTATE HYT00]
2005-08-07 07:52:19 - ! [382] Logon to server '(local)' failed (JobManager)
2005-08-07 07:53:27 - ! [165] ODBC Error: 0, Timeout expired [SQLSTATE HYT00]
2005-08-07 07:53:27 - ! [382] Logon to server '(local)' failed (JobManager)
2005-08-07 07:53:47 - ! [165] ODBC Error: 0, Timeout expired [SQLSTATE HYT00]
2005-08-07 07:53:47 - ! [382] Logon to server '(local)' failed (JobManager)
2005-08-07 07:54:27 - ! [298] SQLServer Error: 11, General network error.
Check your network documentation. [SQLSTATE 08001]
2005-08-07 07:54:27 - ! [298] SQLServer Error: 65534, ConnectionOpen
(PreLoginHandshake()). [SQLSTATE 01000]
2005-08-07 07:54:27 - ! [382] Logon to server '(local)' failed (JobManager)
2005-08-07 07:54:27 - ! [165] ODBC Error: 0, Timeout expired [SQLSTATE HYT00]
2005-08-07 07:54:27 - ! [382] Logon to server '(local)' failed (JobManager)
2005-08-07 07:55:05 - ! [298] SQLServer Error: 11, General network error.
Check your network documentation. [SQLSTATE 08001]
2005-08-07 07:55:05 - ! [298] SQLServer Error: 65534, ConnectionOpen
(PreLoginHandshake()). [SQLSTATE 01000]
2005-08-07 07:57:03 - ! [298] SQLServer Error: 11, General network error.
Check your network documentation. [SQLSTATE 08001]
2005-08-07 07:57:03 - ! [298] SQLServer Error: 65534, ConnectionOpen
(PreLoginHandshake()). [SQLSTATE 01000]
2005-08-07 07:57:03 - ! [382] Logon to server '(local)' failed (JobManager)
During this time, connections are terminated and SQL server does not allow
legitimate accounts to log in. it last for a couple of minutes. The server is
clearly not overloaded, and it doesn't have any specific jobs or anything to
do at this time. I would like to exclude network problems too, because the
machine is otherwise responsive and fine. it's just the SQL server service
that seems to "take a nap". Has anyone seen this before? Win2k3 Ent, SQL 2000
Ent.
thanks> that seems to "take a nap". Has anyone seen this before? Win2k3 Ent, SQL
2000
> Ent.
I forgot one thing, Win2k3 has SP1, and SQL server has SP3 applied.
- Gabor