Ground services gone within a second

Parked at the arrival airport.
Baggage and Stairs connected etc. etc.

Then all of a sudden within a second the Stairs and Baggage etc. etc. are gone.
Disappeared in a second.
This happens not on all flights but on some.
No idea what is causing this.

Anyone an idea why this happens ?

Moved to #community-support:tech-support - use this category to ask for assistance, use the correct sub-category as needed.