I've been troubleshooting this issue for a few weeks now with varying results.
If running on a laptop, try disabling CPU power management in the bios. This feature on some laptops allows the CPU to reduce it's clockspeed to zero if there is no activity on the machine. This seemed to help in some cases.
Also, I noticed if the machine goes to sleep or hibernates, the VM is frozen when waking the laptop again.
I've opened a case with VMware and they've escalated it to their engineers.