Hyper-V Host Agent Problems

Hi,  I upgraded our VMM 2008 R2 SP1 environment to VMM 2012 SP1 RU2 last month which includes a couple of clusters and several standalone hosts.
Since then the VMM agent on the hosts is crashing regularly, every 1-3 hours for some hosts.
I've attached a log from event viewer showing the vmmagent.exe crashing below.
The Hyper-V hosts are all WS2008 R2 SP1.
VMM Server is WS2012
VMM is 2012 SP1 RU2
I've looked at the Hyper-V hosts and VMM server app and system event logs and there is nothing in there of significance.
One thing that seems consistent is the more load the Hyper-V server is under the most frequently the VMMAGENT will crash.
To help alleviate this issue I have set the vmmagent service to always restart after crashing although this doesn;t help when trying to P2V etc as the job fails when the host agent crashes.

http://technet.microsoft.com/en-us/library/gg682077.aspx#BKMK_SupConfigVirtualization
Configuration Manager supports installing the client and site system roles on supported operating systems that run as a virtual machine in the  following virtualization environments.
This support exists even when the virtual machine host (virtualization environment) is not supported as a client or site server. For example, if you use Microsoft Hyper-V Server 2012 to host a virtual machine that runs Windows Server 2012, you can install
the client or site system roles on the virtual machine (Windows Server 2012), but not on the host, (Microsoft Hyper-V Server 2012).
Thanks & Regards, Kedar

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