My note 9 reboots when I have the fingerprint scanner enabled. This happens when I unlock the lock screen. The fingerprint scanner functions normally for authentication in apps and such. It reboots after unlocking the phone. I have done several troubleshooting tips listed in previous posts but to no avail.
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I struggled a lot before finding discussions about this issue. My conclusion was similar to yours. Only I was blaming soap. I'm used to cleaning my S9+ every day with water and soap under the faucet. I stopped letting soap on the sensor and that seemed to work out, so it kind of confirmed that de culprit was it indeed.
So you think we don't need to delete the fingerprint profiles, just drying out the sensor?
The first time this happened to me, some months ago, I just deactivated the sensor and several weeks later I tried it again and worked fine till today when it failed again. Maybe it is water. How about sealing the joint between the sensor and its fixture?! 🤔
As you have run your device under water, there may be liquid damage to your device. I would recommend following these steps for properly cleaning your device: https://www.samsung.com/us/support/answer/ANS00086342/
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I can confirm that after replacing the fingerprint scanner that the problem went away it was about $20 in parts if you are handy and can fix it yourself and if your phone is out of warranty.