I tried the following fixes but none of them resolved the problem:
1. Using different batteries and SD cards
2. I tried to reset the camera to factory settings - it froze on the reset screen until the battery was taken out and didn’t reset
3. I tried to install the latest firmware - again it froze on the install screen until the battery was taken out and didn’t update
So I decided to send my camera in to Nikon Service Centre for a repair quote, with full details and a copy of this forum post. My camera is out of warranty but I was hopeful that Nikon would recognise the problem was caused by SnapBridge and cover the repair costs. I had the following response:
“Unfortunately, there is no known fault with this model of equipment. If there was then Nikon Corporation would release an Technical Service Advisory and a free of charge repair would be offered to customers. I can confirm that the workshop have not found any signs or damage or misuse with your equipment.”
I contested this, arguing that several others have experienced the same problem and should therefore constitute a known fault. In the end after several email exchanges I was given a small discount on the cost of repair. However I still ended up having to pay well over £100 to fix a problem that originated when using SnapBridge as intended.
My camera has been returned having been fitted with a new Wireless Mobile Adapter PCB Unit and new firmware. The problem has been fixed, but I am very disappointed in the quality of customer service from Nikon. Having been a user of their equipment for 15 years I am now considering switching to a different manufacturer.