Fingerprint sensor failure on Xiaomi Redmi S2

Hello everyone,
For about a month, I've been having an issue with my fingerprint sensor that is used to unlock my phone. It is completely unresponsive. Normally, if my finger is misaligned or dirty, the phone vibrates to indicate that it detects pressure but something needs to be adjusted. Now, nothing. No vibrations and the sensor is not working at all. At first, when this started, simply restarting the phone would make it work again. But I've done that several times in the past few days and nothing helps.
Do you have a solution that doesn't involve resetting my phone?
Thanks in advance!