Can you also file an SR with VMware if you're entitled to VMware support?
You can check the microcode version that ESXi loaded with this command from an ESXi console shell:
vsish -e get /hardware/cpu/cpuList/0 | grep Revision
"Original Revision" is what ESXi saw at boot time (usually loaded by the BIOS), and "Current Revision" is what's running now, possibly loaded by ESXi.
I've looked and can't find any microcode issues documented by Intel with symptoms similar to what's described in this thread. For Skylake-D, I believe the latest microcode that's publicly released as of today is 0x02006906. ESXi 7.0p01 includes the slightly older 0x02006901. Version 0x02000069 is still a little older.
You can try having ESXi not load any microcode by running this command and then doing a clean shutdown/reboot:
esxcli system settings kernel set -s microcodeUpdate -v false
