Don't know why but for a few days I have to put password every time i need to unlock . Already have fingerprint and face lock enabled.I think it was a security system where we need to enter after a day or two. But now it is very frequent.
I had issues with the phone keep restarting several times in a day for about 6 months. Saw that phone keeps moving app from internal to sd card. So I removed the card for few days and the problem stopped. Don't know if that was the problem. After for...