[Problem] My Sony Heaphones

[L3d1]

I don't know is this even problem, but I want know something about this weird thing:
1. I went to shop.
2. I came home.
3. I putted my Sony Headphones to my head.
4. I started to hear some random Minecraft kiddies playing Minecraft
5. I though I have rat.
6. I turned my pc off.
7. Even it didn't stop that sound.
8. I saw, my headphone charger were offline all the time.
9. I went around 100m away from my pc.
10. Then it stopped.
11. I went back to my home.
12 I started to hear some Xbox 360 or PS3 sounds.
13. Then it stopped instantly somehow.

Thanks if you can help me. ^^

[Lasch24]

Seems like there are other people using the same frequency for their wireless headphones, the funny thing is that you can hear them...