S8 + working slow

[Abubakarkamyana]

When battery less than or equal .  to 40% mobile switch off or work slow

 Kindly guide how can i slove this issue?

[hamzaking]

Plz view my link
https://ibiking.blogspot.com/2020/04/imran-abbas-bio.html

[Ramzan0005000]

reset your phone

[Abubakarkamyana]

M done it

[Abubakarkamyana]

but nothing

[Abubakarkamyana]

and how can i backup me data