Hi
@AnkitParab 1.Please could you confirm your firmware version? Did you encounter it after upgrading firmware or did you changed sim card?
2.Does this issue with Sim slot happen on both sim slots?
3.Also try test your fingerprint sensor, check as well that there isn't any dust and that is set in the right direction.
If the fingerprint sensor does not work either, try a Sim test and sensor test by going to the calculator type in .12345+ = Do single test for SIM and Sensor