Suddenly the phone is feeling laggy, not working smooth like before

1) during call when i am typing number, there is slow response or mistouch at first. I open the vivo dialer app and press a number but phone doesn't respond, i have to type that number again

2) During camera, the response is slow taking time to click a picture, i press the click button but it doesn't respond i have to press again and photo processing is also slow

3) Google file opening is also laggy

4)File sharing speed through quick share has also decreased

5)Phone is taking more time to spend, it is not utilizing it's processor with it's full capacity 

For your information i have 40gb storage left so don't tell me it is due to storage my previous phone honor play runs like butter even when 4gb space left