I have a standalone ESXi host, not connected to vCenter, that randomly locks up or freezes. It can go a few days or a few weeks between lock ups. When it locks up I am unable to ping the host, the VM running on the host, and when I plug a keyboard into the physical machine I get no response from keystrokes. Even the num lock key won't light up when pressed. The only way to get it back online is to do a hard reboot, push the power button on the physical machine.
I have attached the VMKernel log file.