Hello thealco,
I already tried to unregister and register the virtual machines, didn't work too.
I already reacreated one virtual machine to performed a test and the problem persist.
After reboot when the SO on virtual machine is up if I performed a vMotion the virtual machine can communicate with network too.
It's important to talk, all environment is the same: Servers, Storage, Switches, cables.
No hardware upgrades are performed in environment.