I have 2 brand new AV600 powerline adapters which have been plugged in and paired up.    They work ok for between around 20 minutes, but they then keep losing the connection.  The connection can be down for around 10 mins before they come back on line again.   

I have both adapters plugged directly into the wall socket.  I have also tried plugging them into different wall sockets in the same area.  I have turned "power saving mode" off on both adapters.  I have tried changing different "Traffic type priority".  I have tried "Internet", VOIP" and "Online Game".   I have re-seated the network cables to ensure they have a good connection.  I looked at updating the firmware, but i think they must be on the latest version.

Please advise.