Connection preferences feature does not work
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My network layout is a straight line
Main router and deco at the living room - - - follow by study room and lastly along the hallway my bedroom
The bedroom keeps connecting to the weak living room for some reason. As soon as I use the connection preferences feature to connect the study room ( which is the strongest signal to my bedroom) the bedroom deco just went dead and blink red. And I have to reset the deco again. What is going on tplink. How can you guys screw this up so badly
Tried that still does not work
I swap the decos and restarted.
The main reason is one of my rooms does not have ethernet port to be use at internet backhaul. Hence I'm trying my best to make sure that room has the best internet as possible by selecting the closest and best wireless deco choice.
Below is the screenshot of my bedroom router. The main router signal strength is weak. If I close my door it becomes weaker. If i set connection preferences to my study, then it disconnected immediately and blinks red
Hi, Can I also have a picture of the network map on the Deco App?
Could you please leave me a message with your TP-Link email ID for Deco?
I wonder whether it might be somehow related to the Ethernet Backhaul on the Study Deco. If it was, I think you might have the same issue when setting "Main Bedroom" as the signal source.
Would you mind helping run this test to see whether we could reproduce the same issue?
Wait for your reply and best regards.
Thank you very much for the message and update 
.
Sometimes there are some issues which can not be properly explained, like the previous issue we were going through.
I don't think it is a hardware or firmware issue. It is suggested to monitor the Deco performance for while.
Thanks again and best regards.