Had the same issue with Full Clones along with other symptoms. Some of the sessions were unable to connect to certain websites and on other sessions the Guest NIC would not remain enabled. On each of the hosts, we increased the "Number of ports" on the Guest subnet vSphere Properties for the default of 120 to 2040 (you environment may dictate another value). Once the change was made (requires a recycle of each host), the issues resolved themselves.
We have the same problems with vdi station,
After you change the option" NOT use the same computer accounts"
Is the problem solved??