Hi
ajadhav298,
Make sure your phone is on the latest software version, currently its .78. if not you can check from setting => About => Software information.
Clear cache and storage of Camera App. Go to settings => Apps = Camera
Try under safe mode
Hold power button for 5 seconds => When the screen flashes with option => Press & hold power option => You will get an option to restart in safe mode
If nothing works take a backup of your phone and factory reset.