Same issue here with a brand new JBL Charge 3 Bluetooth speaker. I will get periods of smooth play through the speaker following by intermittent choppy (drop-outs) lasting perhaps 100 milliseconds, smooth play, then a group of drop-outs. Very annoying. Have done the Bluetooth Troubleshoot via Settings and I also got a "fixed" return. Still, problem persists. All drivers are current.
Asus motherboard with Broadcom network chipset. Running Windows 10 Pro Version 1903 OS Build 18362.657.