ThinkCentre M93P not detecting network

I have purchased 5 ThinkCentre M93P's and they are all experiencing the same problem.  When the network connection comes from an IP Phone, the ThinkCentre cannot see the connection.  The only way it can is by unplugging and then plugging in the cable from the phone.  Are there any adjustments to the NIC that have to be made? 

I don't know if it's comparable but I have similar issues on a m72e SFF system with a flaky network card on warm reboots.  Even a shutdown won't suffice unless I disconnect the power cord.
Suspect a bios problem with not properly resetting the network card on reboot in my case.
Disappointed to say the least.
I will keep an eye on this forrum to see if lenovo/users are picking up on this as well.
Hard to deploy enterprise systems when there are network issues!

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