Hello,
Here's the problem:
My Nikon D5500 won't turn off after disconnecting from qdslr app, on/off switch doesn't work, all other buttons too. Actually works only shutter release without AF.
Only battery removal and reinsert reset the camera.
Same behavior over WiFi and USB connections.
I think it is related with host mode as Helicon causes the same problem but Nikon CCP 2 or WMU not.
Kind regards,
Pavlun