VM's running server 2008 32 bit after upgrading from 2003 hang unexpectedly

With the ending of 2003 server support, I upgraded most of our 2003 servers to 2008. These were all 32 bit VMWare virtual machines. After upgrading to 2008 32 bit (non-R2) and applying all patches, and upgrading VMWare tools, I have a group of servers that hang. It seems it can take anywhere from a week to several weeks for it to occur. I have monitored the servers with PerfMon and do not see anything abnormally increasing. It's almost as if it's just a sudden hang. You can no longer RDP to the servers. Connecting to the VMWare console of the VM reveals the VM in a hung state unable to get to the login prompt. Only power cycling the VM brings it back. Has anyone experienced this behavior? Any suggestions are much appreciated.
adneprovAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Make sure you have VMware Tools installed, and you are using the VMXNET3 network interface.

Also make sure you are running the latest version of the VMware vSphere, for 5.0, 5.1 or 5.5. (6.0).
adneprovAuthor Commented:
That all checks out. Any other suggestions? Any suggestions on a good monitoring process that logs real-time? I was running a PerfMon counter set, but once the server hung it did not save. I can have it save periodically but that still may not help since nothing is creeping up over time that I can see.

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Performance Charts in vCenter Server ?

The VM is not running on a snapshot delta disk.
adneprovAuthor Commented:
NO longer an issue
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Windows Server 2008

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