After Update my T7AB directly from 9.33 to 10.44 Dual Grid + MOB where immediately w/o Data and thus useless. I did Hard Reset and more than one Factory Reset, to no avail. Problem was there immediately even with no other customization of the watch. BUT all activities sync to GNSS immediately and CIQ App GNSS Info 747 locks GPS within 5 secs.
Thus: hardware problem is unlikely. I opened a case with GARMIN. To my surprise they did not hear about such problems. That is why I'm asking.
If there is someone else out there with similar problems maybe we could connect those cases for better means of diagnostics.
Of course I tried every possible combination of GNSS systems, again to no avail. I don't think there is anything else to be done from my side. Allthough I'd be happy to learn otherwise
Workaround is using GNSS Info 747 or tools alike, of course that is not satisfying esp. for MOB scenarios. But than: it is winter over here. ;-)