One of my camera will not scan the QR code

I bought three cameras and two of them are working just fine. The third one is the issue. It will not scan the QR code. What should I do? could it be defective?

Hello, thank you for posting. Please try the troubleshooting steps from the link provided below. Let our customer care team know at if you continue to face problems.

Same problem. Camera worked for months, suddenly disconnected. All other cameras still worked.
I attempted to re-connect the camera.
Power down, reset, etc, even reset router and had the camera right next to the router for setup.
I get to the part where it tries to read the QR code, and nothing happens.
I know the QR function works, I can read these codes elsewhere. I went to the QR code reader in the account/help section of the phone app, and the QR code reads fine.
I have 9 cameras, the Yi 1080p, and the others function.
I took one of the working cameras down to the location of the malfunctioning camera to verify that the signal is OK. That one would not connect, either. When I put the previously functioning camera back to its original location, it would no longer connect and I get the same error when trying to re-connect.
I recently purchased 2 new outdoor cameras, and they both have the same problem, the QR code will not read. In addition, the language on the 2 new cameras is not English.
I removed the SD card to test and still no connection.
I have sent several emails, but each response is the same, the tech does not read previous emails and tell me to do the same steps, ALL of which I have done repeatedly.
I supplied all the information asked for. They want to replace all 4 units. Is this the only option?
If I cannot rely on these cameras working reliably in the future, it may be best to scrap all 9 and get another brand.
ticket number: # 1127090
Posted on several threads, in hopes that someone can help.