Why is the music player shocking?

Good evening. The music player began to bother. The case is beating current, and quite unpleasantly. But! Beats only in the kitchen, in the hallway and in the bathroom less. I have a private house. In 5 meters from the house there is a 6 kV transmission line. The kitchen, the corridor and the bathroom are approximately on the same line from the power line, and the rooms in which the player does not shock are located further. (I'm talking about power lines, because some kind of electric field can work) !? In the kitchen and in the bathroom there is an outlet with earth, in the corridor it is not! And in the rooms, either. What is the meaning of fiction: by connecting the player in the room through an extension cord, he does not beat, but taking it and going out into the corridor-beats, he beats in the bathroom, and even stronger in the kitchen. He returned to the room, all the rules. The player is in the kitchen and we use it, but it began to irritate me very much !! Does this phenomenon have an explanation and how to get rid of it? Thank you