Suddenly my iPhone earphone(headset) went quiet! Is there a way to fix it?

Suddenly my iPhone earphone(headset) went quiet! Is there a way to fix it? I used to connect it to my desktop computer and my laptop computer and of course the iPhone, I usually listen on full volume in all three devices and suddenly the earphone went very low volume (slightly hear songs playing, it's not completely quiet) .
I got another earphone, It works fine with my iPhone which means the problem is not in the iPhone.

Is there a fix for it?
Why this kind of thing happen is it because I connected it to other devices?

Show it in a electronic shop or else buy a new one

At first, you have to check the wire connection of the earphone. If you can't do that, then show it by a mobile electrician or you can buy a new earphone.

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