Kinivo BTH240 Bluetooth Stereo Headphone Turns Off

Kinivo BTH240 Bluetooth Stereo Headphone sometimes turns off for no reason when it is not being used. It has happened to me that I press the play/pause button to pause it, and take it off my head, but after a few minutes when I put it back on and press the play button, I find out that the headphone has turned off. Has anyone had a similar experience? Does anyone know how to get around this issue?
I purchased the headphone less than 2 months ago.