All right, I think the Diagnostics app detected a major issue in your fingerprint sensor.
My best advice to you is to book an appointment at a Samsung Service Center near you. Our techs will be able to narrow down the issue for you and fix your fingerprint scanner!
You can do it through Support > Book an appointment, or you can also send us a message through Facebook / Twitter / Instagram and set up your appointment from there.
Again, I'm sorry this is happening to you! Hopefully you can visit us soon to get this issue fixed.
We are sorry that we cannot give even a rough estimate here. But rest assured that our Samsung engineers and technicians are competent to assess your device first with suggestions, and offer to provide prompt solutions to restore it up to optimum performance.
You may click the link below in order to locate the nearest Samsung Authorized Service Center in your area.
