Thanks but are you saying to unplug XT and switch it off and also close Garmin Express then come back tomorrow and turn on XT again ?
If so, I’m not sure what can change overnight?

I have exactly the same issue.
Supposed to be on a trip in 2 weeks and very annoying that this has happened now !!!

Hi.
Just joined up as my XT is playing silly buggers.
I turned it on today to update to latest maps in preparation for a trip in a few weeks.
I came home after a few hours to see a screen saying that the installation had failed due wifi error and it was trying to reconnect.
It stayed on this screen ...