@resham7998 sounds more like a software problem than a repair issue. I would suggest that you clear your cache and your browser history etc. Backup all of your pictures and files you an't afford to lose. Then do a reset on your phone.
"***Open Settings, and then swipe to and tap Apps.*** ***Select or search for the app you want to clear.*** ***Tap Storage, and then tap Clear cache***. Note: The only way to clear the cache on every app at the same time would be to perform a factory reset on your phone." from [https://www.samsung.com/us/support/answer/ANS00077611/#:~:text=Open%20Settings%2C%20and%20then%20swipe,factory%20reset%20on%20your%20phone.|here]