I have a Deco Mesh wifi set up, with an X50-DSL as the main unit, and a 2 E4 satelites. This was working fine until I moved one E4 unit's location. Now when my phone tries to connect to it, it says "incorrect password" and does not accept the password that I know to be correct. The other two units connect find. I have tried limiting it to 2.4Gz only (i.e. no 5GHz as was suggested might be a problem in another thread) and I checked for system updates - it says my firmware is up to date.

I have also tried to remove the unit from the system, which I understand should reset the satellite unit and then reconnecting it. This does not resolve the problem.

Any help with this is appreciated. 

thanks in advance.