My wife has been running my Lumia 640 with Windows 10 Mobile 14393.576 to see how it works in "real world" use. The trouble is the internet connection is extremely unreliable in that a lot of the time she keeps getting "No Connection" when trying to browse the web making it unusable. I have looked at the settings and can't see anything obviously wrong. Anyone else having the same or similar problems on T-Mobile?