@TP-Link Then, I have to ask just what is "roaming". The descriptions, in your ads, certainly imply that your device will switch to the nearest device as you move around.

@Alexandre. Sorry, I did reply but it does not appear, here. The answer to your questions is yes.

Tried this. No difference.

I am sitting next to my main M4 unit but my phone is connected the the unit downstairs. I have disconnected from wi-fi and reconnected but it is still using the wrong unit. I even rebooted my phone...

@Microbrain I had been unable to use the software to fix the issue as it kept freezing. I had also tried connecting, manually, through the control panel but I must have messed that up. Support had me...

@gwinegarden UPDATE!! Worked with Brother Tech Support and they were able to determine that it was at the printer end. They helped me resolve the situation.