Hi @Turnbug51 as it's a single device it's unlikely to be a hub issue causing that. The device should change the connection from the hub to the disc and the other way around when moving around the home.
If you take the IPhone X downstairs and turn the wireless off and on again on the device does this give the IPhone X a better connection?
Thanks. This was my view. I am visiting an Apple store shortly and will seek further views. I will report back on my findings.
The advice from Apple was to complete a clean download of the core software and restore my iPhone from a back-up. I have now performed this set of actions. Unfortunately the iPhone XS still remains a problem in our ground floor rooms. Apple is insistent that the problem I am encountering is not their problem as the iPhone connects to wi-fi wherever I am.
I can see where both BT and Apple are coming from but the wi-fi remains a problem for me in certain rooms in my house . I suspect there is nothing we can do and that I must live with the problem until either there is a change in the software or I change iPhone models.