Speaker Switching Automatically While on call.

[Lovely999]

While i'm calling on bottom speaker mode the mode automatically switch to top after some seconds and i have to tap on it again to change it.  

Same happening on whatsapp. 

What the issue???? 

How to fix? 

Device is Galaxy Note 8

Android 9

Updated to april security patch. 

[Dilli]

Restart your phone and check

[Lovely999]

doesn't works

[Dilli]

take your data backup and rest your phone to factory default. Most issues gets resolved