Did you buy it directly from Google?
A repaired device is usually a ****ty device. It will no longer have any decent seal and therefore your dust and water resistance is out the window. The assembly process is being done in a sterile environment, the repair process not so much. Which means that it has a lot of potential faults.
Especially this early on when Google didn't even have the chance to repair anything, it should be relatively easy to get a replacement.
I just ordered my replacement from Google. It went pretty smoothly. Fingers crossed for the new device...