sudden high virtual machine utlization

Our environment consists of UCS with B200M5's, Cisco MDS 9396 fiber channel switches, and Dell EMC PowerMax storage arrays. We are currently on the latest build of ESXi which is 7.0.3 build 23794027 and the version of vCenter is 7.0.3.01700. We updated the firmware of half our UCS environment from 4.2.2d to 4.3.2a several month ago. Didn't experience any issues at all. We updated the firmware in the other half last week and all of a sudden we have random virtual machines with CPU's spiking to 100% utilization. They become completely unresponsive, and you can't reach them via rdp nor the console in vCenter. If you vmotion the machine to another ESXi host it immediately resolves the issue and the CPU goes back down to what would be considered normal utilization. I opened a case with VMware and currently they are pointing fingers at everything but VMware. Has anyone experienced this performance issue before?