M9 Plus Deco units bypassing other units causing weak signal
We have an old house with thick walls so bought a Deco system to get the signal around the house. It worked okay for a while but the signal keeps dropping. We've now discovered the the unit next to our TV is simply bypassing the next one in line of sight and trying to connect to one in another room behind thick walls. It simply cannot work with that one, which is the whole reason we bought the system in the first place. How can we force the 'tv' unit to talk to the 'dining room' unit and NOT the 'office' unit? We have the main unit plugged into our BT router directly. From there we have one in direct line of sight to 'office'. Then direct line of sight to 'dining room'. There's also one upstairs from there. Finally the one in the TV room. We cannot watch anything on TV without it constantly dropping out which is hugely irritating when watching sports. Please can someone help with this? I bought 2 further units (accidentally M5 instead of M9) thinking we just needed more units but they don't work at all despite the Deco website saying all units work together.
We've Googled and followed all sorts of instructions, plugged in ethernet cables to join units, moved them around, all to no avail. Please HELP! :)