We have been getting hammered with these errors on VM's lately.
Seems like every morning we come in and have a VM down. We look in vCenter and we see this message.
You click okay, the VM powers off. You can then power it back on and it looks as if it crashed.
I'm not sure what is causing this. The only activities taking place are snapshots being requested by Veeam for these VM's in the middle of the night.
We have a case open with VMware (first shot at troubleshooting) but I figured I would share this here and see if anyone else has come across this issue recently.
We are running a 5.5 environment and this has continued to happen even after updating our hosts and vcenter to the latest patch.