Server 2012 Hyper-V virtual machine management service terminates unexpectedly

Hi,
I am using Server 2012 RTM ver enabled Hyper-v. Sometimes the VMM service terminates unexpectedly and then i need to start it from Hyper-v Management console. Previously this server has Win 8 server, in that also same issue occured. I also have w2k8 R2 SP1 hyper-v servers which doesnt show this problem.Is anyone aware of this issue with Win8/2012?.Please send your valuable input