Many thanks for the infomation on the logs.
The following is an extract from the final part of one guest vmware.log just before the crash.
2013-01-23T03:04:12.581Z| vmx| I120: GuestRpcSendTimedOut: message to toolbox timed out.
2013-01-23T03:04:27.580Z| vmx| I120: GuestRpcSendTimedOut: message to toolbox timed out.
2013-01-23T03:04:27.580Z| vmx| I120: GuestRpc: app toolbox's second ping timeout; assuming app is down
2013-01-23T03:04:27.581Z| vmx| I120: GuestRpc: Reinitializing Channel 0(toolbox)
2013-01-23T03:04:27.581Z| vmx| I120: GuestMsg: Channel 0, Cannot unpost because the previous post is already completed
2013-01-23T03:04:27.581Z| vmx| I120: GuestRpc: Channel 0 reinitialized.
2013-01-23T03:04:27.581Z| vmx| I120: GuestRpc: Channel 0 reinitialized.
2013-01-23T03:04:56.321Z| vcpu-0| I120: GuestMsg: channel 0: wrong cookie, discarding message.
2013-01-23T03:04:56.321Z| vcpu-0| I120: GuestMsg: channel 0: wrong cookie, discarding message.
2013-01-23T03:04:57.323Z| vcpu-0| I120: GuestRpc: Channel 0, guest application toolbox.
2013-01-23T03:04:57.326Z| vcpu-0| I120: TOOLS autoupgrade protocol version 2
2013-01-23T03:04:57.327Z| vcpu-0| I120: Vix: [5860 mainDispatch.c:3787]: VMAutomationReportPowerStateChange: Reporting power state change (opcode=2, err=0).
Any suggestions on what the issue is please?
Many thanks
Dave