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I bought TP-LINK - TL-WPA4230PKIT Wireless Powerline Adapter Kit - Twin Pack in May 2016.

It was working fine up to a few days ago.

In the same room, extension has been since May 2016, Powerline LED is now OFF

1/ When I move TP-Link extension device to same room as pass-through TP-Link device, Powerline LED is ON and this is working again
2/ I did reset devices without any success in 2 different rooms
3/ I resetting pairing without any success in 2 different rooms
4/ I tried to re-do clone without any success in 2 different room

Why is powerline LED is only ON when I am in the same room? Why wasn't it the case in the past 12 months?

Thanks in advance for your replies.
Jerome.