My device keep turning on! Why?

Good afternoon!

My device keeps turning on (when disconected or conected to the power source).

When I turn it off, it turns on again automatically few seconds or minutes later.

I have seen some people with this problem, but I didn`t see any solution to it.

-> It keeps turning on even when it`s not conected to any bluetooth device;

-> It keeps turning on till the battery dies, so I never have a battery life when I need it;

-> I think that maybe it have to do with the power button, but I`m note sure.

Can anyone help me?