display blacks out

[Donberg]

With the USB 3.0 dock (Lenovo branded), on a regular basis (every 1-10 minutes) my display will black/blank out and come back on after 10-30 seconds. I have two of the docks, and one works fine when I plug it into the same laptop with exactly the same connections as the other dock that blacks out regularly.

Do I have a faulty dock?

Thanks!
Don

[Donberg]

Lenovo sent me a warranty replacement for the dock and everything is working now.