In reference to everyone's replies here, I have had this issue 4 times. Every single time, I've received a new pair from Apple Beats 3 earbuds. They work fine at first for a few of my outdoor runs and then it happens, out of no where, they stop working! I have no other solutions either and Apple has't been able to resolve this issue for me either. Apparently, there only solution is to replace them with new ones every single time since it isn't worth the cost of repairing them for Apple.
After careful review on my usage, I think sweet is getting into the controller located on the cable portion. Though Apple doesn't really state there is an IPX rating (water resistance rating level) to this device ( at least I haven't found the rating), I don't think it is 100% true.
If you look at the little plastic lid that covers the buttons (held by small clips), you will see the contacts are exposed and the salt from your sweat might be negatively reacting with the controller's internal components.
At this point, I am out of options and it seems that I am out of $249 bucks! Apple won't refund me because I bought them at Best Buy (Never again buying an Apple product there!) and Best Buy won't refund anything because I am pass the 14 days and they don't warranty them since Apple covers the warranty....Which at this point it is useless unless I keep getting new ones every couple of weeks smh...smh...😠😟