Bluetooth HeadPhone does not work properly

Hi, I just bought a Aluratek ABH01F Bluetooth Stereo Headset with Built In Mic (Black) and it connect with my iphone 5. Two days it worked fine but then only right side of the headphone was working. I tried to pair it iwth the other phone and it was fine. There is no issue in the headphone. I update the software on the iphone but the issue is still there. Can anyone help me with this issue or put somelight if I am doing something wrong?

Thanks