First, I tried restarting the phone and clearing the cache. This didn’t work, so I decided to try a factory reset. I backed up my data, and then reset the phone. Unfortunately, this didn’t work either.

I then decided to take the phone to a repair shop. The technician opened the phone and found that the back button had become disconnected from the motherboard. He reconnected it and tested it a few times to make sure it was working properly.

The technician also gave me a few tips to prevent this from happening again. He said to be careful when using the phone, and to avoid dropping it. He also suggested using a case to protect the phone from any potential damage.