SBS 2008 freezes on VMWare ESXi 4.1

I'm running a SBS 2008 and a Windows server 2008R2 on a VMWare ESXi 4.1 host.
Every few days the SBS 2008 freezes and is unresponsive. AD, Exchange, DNS, DHCP are not working, but it is responding to PING. Remote Desktop tot the SBS 2008 is also not working.

The Windows server 2008R2 is still responding, but I can't login is a domain user because AD is not functioning.

Also thru the vSphere Client Console the SBS 2008 is not responding. A soft restart or shutdown is also not working. Only a hard shutdown and a restart will bring te server back online.

Any ideas?
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nazg82Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Is your server firmware up to date?

Is your ESXi host running the latest update from VMware?

Are you using VMXNET3 interface?
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nazg82Author Commented:
Hi Endrew,

Is your server firmware up to date?
yes

Is your ESXi host running the latest update from VMware?
no, it's at esxi 4.1 update 1. (348481) Before we update to a later version, I must know if there are any known bugs that comply with my situation or updates that will resolve this issue.

Are you using VMXNET3 interface?
no, E1000
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Update 1 is very old, there are many issues, I would also switch to the VMXNET3, recommended, the E1000 is legacy, used for installation only.
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Adam RayCommented:
As an FYI, I once had a similar setup. SBS2008 and 2008R2 running on ESXi 4.1 U1, E1000. My SBS 2008 would occasionally freeze in the same way you described.

As it was years ago, I don't remember the exact timing of events, but I believe the problem did not occur after I updated to a more recent version of ESXi and switched to VMXNET3 (did both at the same time.)

Disclaimer: The problem with my SBS2008 VM freezing was a reoccurring one, but it wasn't nearly as frequent as every few days. So our problems may well be unrelated.
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