Auto unlock always late

I am not very satisfied the last time with the auto unlock mode from Nuki.
I takes way to long to auto unlock and open the door. The geofence is set on 200 m. but this is not how it acts. I also use Presence from Homey which is set on 200 m. and that signals mostly on time when i enter the fence. Nuki is always much later and i always have to wait in front of the door until it opens. So i can’t be slee mode from my iPhone because Homey does detects the phone at the right time.
So what could cause this issue???