Some new problems appeared ..
whenever I try to record screen with Mi Screen recorder , after 1 or 2 minutes it stops recording itself and app closes . The might be linked with the background app closing immediately after exiting any app . Even with 3rd party app DU Recorder I could not record screen activity .

Another annoying thing is frequently locking of app and demanding of fingerprint for accessing any app even when I am already inside an app , after few seconds it gets locked .