Headphone probelm please help

[blowinghouse]

Hello, first of all, my native language is not english, so dont judge me for writting this with a lost of mistakes.

So yes, I didnt know where to post this so I tought I will give it a try in this forum.

A few weeks ago I was using samsung headphones, yes the ones that come with Galaxy Note 4. I used them for about 1-2 months when suddenly I noticed that the right headphone started to sound lower then the left one. No I have no hearing problems. I put left headphone to the right and it sounded fine. So I tought that it broke. I tried to put it to my laptop and phone, nothing changed. So I gave up and threw them away. After telling this to my friend he was like, I can borrow you mine. Cuz i travel alot and listen to music. He gave me his LG G4 headphones. When I put them to my phone and first 5-6 hours it was all good. When I went to bed I suddenly noticed that now the left headphone is lower than the right. But now with my friends headphones. I also tried it to put it into my laptop nothing changed.. What i have also noticed is that the Samsung right headphone started not to work properly where the mic is, and where u can control the sound. And on G4 headphones the left one had the mic and control buttons, wich started also to sound lower. I tried balancing everything was in right place. Also the sound quality on my phone and laptop started to sound bad, bass and music quality also changed it went a little bit worse.  I use Nexus 5 as my music source. And my laptop is running Windows 10 with newest audio drivers. So did anyone had anything similiar? The headphones were new. At least my friends one. And no I didnt pull any wire, and I was extra carefull with my friends one. I tried to clean also did not help.