Displayed Activities not showing up

On my Forerunner 45 I can’t adjust the displayed activities. It shows the standard run / treadmill / bike / walk / cardio but in the Connect app when I go to the screen Displayed Activities to add an activity the runner just keeps running, nothing else shows up and eventually after 5 minutes or so it reads ‘Network Connection Error’. Which can’t be the case since all other adjustments work out nicely.