For anyone who is wondering for solution after OneUI 7 update.

[Vik_Bedi]

I've noticed these problems after updating my phone to OneUI 7, Followed as:

1. Poor battery backup. 

2. Unreliable performance.

3. Lagg and stutter (very frequently).

4. Mobile data isn't working.

5. App-drawer bug.

Solutions:

1. Reset all settings individually eg. Bluetooth, Accessibility, etc..

2. Reset "App preferences".

3. Reset "One UI Launcher". You can re setup your home-screen according to your taste.

*The problems I've listed above, got solved after performing the listed solutions. Hope works for my readers as well.

[Vik_Bedi]

Note: Battery backup while using a device gets stable. The idle drain is One UI 7's default issue.

[Vik_Bedi]

Also! If possible then wipe the cache partition through the Android recovery. 👍