How do you unplug the WiFi network interface in a SFOS (XG/XGS) under 19.5 GA

Unplugged means, the wireless network (separate zone) exists but no access point is attached in the config. 

Fine, and how do i attach these AP´s to the zone?

All AP´s are already assigned to this zone...

Could you show us the Wireless Group? 

Try to delete this group and generate a new one. This should connect the AP. 

this only work for a couple of hours or one day
and then it get´s unplugged again...

I would again recommend Central Wireless to avoid this topic. 

The problem started with 19.5 GA, i´ll try a downgrade to 19.0 MR2 and test with XG106w.
But branch office has XG125 ..

Just wondering, why do you not move to Central Wireless, if you have such issues with the Wireless solution? You could move to VLAN, bridge to VLAN and resolve the need like that in Central wireless. 

I do not recommend to use separate zone at all, if there is another way to resolve it via VLAN or Guest network in Central Wireless. 

Just wondering, why do you not move to Central Wireless, if you have such issues with the Wireless solution? You could move to VLAN, bridge to VLAN and resolve the need like that in Central wireless. 

I do not recommend to use separate zone at all, if there is another way to resolve it via VLAN or Guest network in Central Wireless.