Since updating firmware on all our M600 blades in order to attempt to resolve another issue ( http://www.delltechcenter.com/thread/4353610/M1000e+fans+and+the+M610x...what%27s+happening%3F), we have started to have problems with various network connections randomly dropping out - usually for about 10 minutes - before returning with no intervention. The whole time, the following error is logged in the Windows System event log:

Log Name: System
Source: IPMIDRV
Date: 09/12/2010 09:53:46
Event ID: 1004
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: hostname.domain.com
Description:
The IPMI device driver attempted to communicate with the IPMI BMC device during normal operation. However the communication failed due to a timeout. You can increase the timeouts associated with the IPMI device driver.
Event Xml:



1004
3
0
0x80000000000000

3638
System
hostname.domain.com



\Device\00000066
000004000100000000000000EC030580000000000000000000000000000000000000000000000000E50000C0



Can anyone enlighten me as to what the problem might be?
We've had these errors on at least 5 of our 8 M600s, all on Windows 2008 R2.