@Claus: it souds like your latest SW update corruped your watch, Please Claus send us a mail to firstname.lastname@example.org
and we will support you. Sorry for the inconvinience.
@Ra88: your case is a bit difficult. it sounds like the watch still had some bad assist data. Can you try again to turn watch off and on witing range of hte wi-fi and see if now it behaves as it should?
We seem to have a bug and the watch is not always shown when in range of a wi-fi