Mi Band 2 - connected but not working


I seem to have some issues with MI Band 2. It used to work as should be for a while. Lately I’ve been not so consistent with sleep tracking so not sure when the problem started to occur. It connects normally - I have a notification from MI fit that it’s connected, when I start sleep tracking - it shows notification that mi band is connected and interval is 10s. That’s when it stops.

When I enter use wearables and try to test it, there is this circle trying to load the graph but it’s stuck on that.

Not sure where the problem is. Already reinstalled everything.

Using OnePlus6.
R. Kamil