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Check the VMware Hardware Compatability Lists HCL here
The VMware Hardware Compatibility List is the detailed lists showing actual vendor devices that are either physically tested or are similar to the devices tested by VMware or VMware partners. Items on the list are tested with VMware products and are known to operate correctly.Devices which are not on the list may function, but will not be supported by VMware.
http://www.vmware.com/go/hcl
Also are you using the OEM Build downloadable from your vendor ?
So check firmware, update if necessary, use the OEM version, check RAID is stable, and no failed disks.
Are you using the lastest version of ESXi ?
There are some ESXi bugs, caused by using VMXNET3 and E1000 in the VMs and certain OS.
see here - check your ESXi 5.5 build, and VMs, is this the problem, it's very common
ESXi 5.x with E1000e adapter fails with purple diagnostic screen (2059053)
what is your ESXi build ?