Error on IOS 14.6 update?

I have experienced some issue with ios 14.6 on my iphone 7 plus. Issues are :

1. system hang! sometime i have experienced on fluent running the apps and phone unlock. Apps get hung during screening and if i get to lock and unlock again it's working back.
2. sound is also low then before updating ios. I mean loud speaker is not heard as clear and high as before updating to ios 14.6
3. ringtone volume is not heard as high as before.