There is no sound on my iPad while FaceTime, Youtube, Typing etc

Everytime I join a facetime or discord (turning on camera), the video that I am watching on youtube are running fine. Until couple minutes, the ipad loses the sounds. I even cannot hear my keyboard typing, notifications, the talking voice on the call, and my youtube sounds. This has been happened for serval days. I tried many ways and barely anything works.. I tried reset the ipad serveral times as well, but the issue will just gonna repeat. Please help cause I need to watch my asmr to fall asleep 😭

[Re-Titled by Moderator]