I have three TP Link powerline adapters model number TL-PA8010P this morning I noticed that the middle led was not lit.There are two adapters upstairs in two rooms.I unplugged the two adapters and took them downstairs and plugged them into adjoining sockets pressed the pair button on the first unit for 1 sec waited 120 seconds then pressed the pair button on the other unit for 1 sec then put them back where they were before and all three lights were on for about ten minutes then the middle one went out.Did this four times same result.Have just noticed the the middle LED on the unit connected to the router was not lit.Can someone tell me the correct procedure to get them paired again