I am running a vSphere test lab in WMware Workstation 9 on Windows 7 Pro. Hardware is an i7 processor with 32 GB of RAM. I run 3 ESXi 5.5 hosts with 8 GB RAM each. I also have a Windows 2003 DC, an Openfiler VM and vCenter running in VMW. Within the ESXi hosts I run 6 CentOS VM's, the vMA and one Windows 2008 server.
Everything runs smooth as silk except that about once a day one or two ESXi hosts will disconnect from vCenter. When I try to re-connect it says that the host is unreachable even though I can ping it. the only way I can reconnect is to reboot the ESXi host.
I am using vCenter VA but I had the same problem when running the Windows version of vCenter.
An ideas why it disconnecting and any possible solution.