If you find that your earbuds drop their signal occasionally, this may be due to a loss of signal through the water mass within your body (Bluetooth can't travel well through liquid).
This more commonly occurs when the earbuds are used in open space where Bluetooth signals can’t bounce off walls in an enclosed space, to help them amplify.
If you tend to keep your phone in one particular pocket (the right pocket, for example); it will probably help if you make the earbud on that side of your body, your primary earbud (this is the one that connects directly to your phone).
With Melomania 1 the first earbud out of the case ALWAYS becomes the primary earbud that connects to your device, there is no setting or memory for that. You can see which is which in your device's Bluetooth connection list. Using a front pocket will also help provide a stronger signal.