Nintendo switch controller crazy?

So I mean the Joy con controller, because if I e.g. With a friend Minecraft or other games alone, the controllers spin around so that I can e.g. Run by yourself or in the main menu do you just make yourself independent and move somewhere. Is there a way to repair it?

Yes, there are numerous tutorials on the Internet for this type of "independent movements" of the controller. You may need special tools for the repair, unless the problem can be remedied externally or with the "recalibrate controller" function.
There are many videos on YouTube with repair options on the subject of "drifting Joy-Cons", or you can send the controllers in for repair.
I just bought some new Joy-Cons.