If you are having problems with a NIC staying connected, it could be due to the number of ports configured on the vSwitch. By default there are 24 ports configured, so if the number of virtual machines running exceeds that number they may start to become disconnected. Check /var/log/vmkernel for these messages:
Net: 1317: can't connect device: VM Network: Out of resources
If this is the case, then either move some VMs to a different vSwitch or increase the number of ports on the vSwitch. Increasing the ports will require a reboot.
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