The headphones could also have been damaged due to bad charging. If Beats Won’t Charge due to Bad Battery, Overusing the headphones even when the power is critically low could damage the battery. It is quite possible that you have drained the battery level in your Powerbeats 3 to a critical level and would need to charge the tool on an immediate basis.
In such circumstance, it is best you contact the company or take it to an Apple store nearby. It could be as a result of an internal problem due to a glitch in the software of your headphones. The problem may not be from a really simple one as you think.
Posible Reasons- Why Your Powerbeats 3 May Not Charge.