I've had the same issue for ages. But finally got it fixed today!
I have a MacBook Pro 13in Late 2011 with High Sierra 10.13.3 and Dr Dre Beats Wireless Studio Headphones. They work fine with all other devices (Windows 10 laptop, iPhone, iPad, etc), so knew it is my MacBook.
I first reset my Bluetooth:
- Press Shift+Option and click the Bluetooth icon at the top.
- Go to Debug>Reset the Bluetooth Module
- Restart
That didn't work.
So I then I reset my PRAM and SMC
For PRAM:
- Shut down MacBook
- Press the power button and then immediately Command+Option+P+R and hold while your grey screen comes up, and continue to hold until your MacBook restarts again. When that grey screen comes up again, release.
Then for the SMC:
- Shut down MacBook again
- Keep the power cable plugged in (for my model)
- Press Shift+Option+Control on the left +Power button
- Release
- Start up your MacBook
For full info on these instructions, read: How, When, & Why to reset the PRAM & SMC on your Mac
This worked for me. Hopefully it works for you too!