I have accidentally found alot of my contacts in recycle bin. This problem occurred two time with me. Can anyone help me how all these contact were automatically deleted.

From few days one or two times a day nu A50 phone signal suddenly disappear , it appears that no sim card is inserted,, then only one sim signal showing and it after a minutes the other sim start working.

After last update i am facing some problems like i want to unlock phone but screen remain off. Phone gets hanging. Apps closes automatically and appears Samsung UI is not responding