Hi, experiencing the same issue. This problem occurs when copying something from inside the VM. I copy a file, which is 3GB, from C:\ to C:\Temp inside the OS of the VM. Then the warnings start to appear. I also experienced this when installing/upgrading the VMware Tools of the VM. It is really frustrating, because I absolutely see no slow performance inside the VM's.
We upgraded firmware, OS, drivers of all parts. No result.
Erwin