@terziyski Thank you so much for going to so much trouble with your solution. I have confirmed that the Re550 is set to maximum coverage and I will now work through the other elements of your...

I am using an AC1900 MU-MIMO wifi range extender, known in the UK by the reference RE550. There is one device (an external EV charger) which receives only a weak signal from the extender and it is...