Bluetooth issues on note 2 when paired to speaker
When you say slightly move, how much do you mean exactly? There's a range Bluetooth devices work in. Are you sure you're not moving out of range? 

If that's not the issue, try updating your phone, or installing a custom ROM. Another possibility is that there is a problem with your Bluetooth driver, but an upgrade in your phone might solve it. Note at this point it's like threading a needle in the dark and the issue seems rare, so it might not actually solve the problem.