(calendar) synchronization is very slow

For instance when I add a new entry (to any calendar) it shows up in the calendar app on the watch immediately, but I have to wait for a few hours until it shows up on the watchface. At the same time events often are not removed until hours after they have elapsed so it seems like a general synchronization problem. I never had this problem before I upgraded to the paid version of the app so maybe it has something to do with the update? Another symptom is that when I open the app on my phone and I select a different watchface it gives an error that no watch is connected even though there were no issues before: notifications were coming in normally. Then when I send the new watchface a second time after a short pause it does work