Comtrend Powerline adapter problem - no ethernet light?

[Moyt]

Comtrend Powerline adapter. Don't know what model it is, see attached picture:
These are meant to be brand new I got off someone, but I've had nothing but trouble with them from day 1.
One adapter works right away no problem, the other adaptor not so good. The Ethernet light just won't light up. The only thing that stays lit is the 'status' red light.
If I plug in the other powerline adaptor to the Ethernet cable, the Ethernet light lights up right away no problems!

Now I'm noticing if I leave the faulty powerline adaptor plugged in with the Ethernet cable for 10mins or so, the Ethernet light will eventually light up and functions!



Any ideas what's causing this??


Very strange...