My wifi network disappears after a restart of the Box 12b

Hi KPN Community,

I recently got a new KPN Fibre connection installed at home with a KPN Box 12b router. The technician came today and set everything up and all lights on the modem are green.

However, during the installation the Wi-Fi network wasn't showing up at all. The technician mentioned it was a known bug and after a few resets, the Wi-Fi eventually appeared and worked fine.

The problem is: after I turned the modem off and back on again, the Wi-Fi has disappeared again and is no longer visible on any of my devices. even though all the lights on the router are still green.

I've already tried:
- Turning the modem off and on again (multiple times)
- Waiting several minutes for it to fully boot

Has anyone experienced this with the KPN Box 12b? Is there a specific reset procedure that fixes this permanently, or is this a firmware issue that KPN needs to resolve on their end?

Any help would be appreciated. Thanks!