Bluetooth Audio Stuttering, Fix Choppy Sound on Windows
Bluetooth audio stutters when the wireless link is crowded, when Windows drops to the low-quality Hands-Free profile for a call, or when the audio driver cannot keep up. The fix depends on when the stutter happens, so note whether it is constant, only in calls, or only when you move around.
Fix it, in order
Move closer and clear the path. Keep the headphones or speaker within a few feet of the PC with as little in between as possible. Walls, a metal desk, and your own body between the device and the PC antenna all weaken the link.
Move away from interference. Bluetooth shares the 2.4 GHz band with Wi-Fi, microwaves, and USB 3 devices. Move USB 3 drives and dongles away from the PC, and if your Wi-Fi router offers 5 GHz, use that for the PC so Bluetooth has the 2.4 GHz band to itself. If you have to stay on 2.4 GHz, use the Wi-Fi channel planner to pick a less crowded channel.
Use the Stereo profile for music. Click the speaker icon on the taskbar, then the arrow next to the volume slider, and pick the entry without Hands-Free in the name. When an app turns on the microphone, Windows switches to the Hands-Free profile, which sounds much worse and can stutter, so close the app using the mic if you only want music.
Disable Hands-Free Telephony if calls are not needed. Open Control Panel, Devices and Printers, right-click the headphones, select Properties, open the Services tab, and uncheck Hands-Free Telephony. This stops Windows switching profiles, at the cost of the headset microphone.
Turn off audio enhancements. In Settings, System, Sound, select the Bluetooth device, and turn off audio enhancements. Then open the device properties and set the format to 2 channel, 16 bit, 48000 Hz, which is the most compatible setting.
Stop Windows powering down the adapter. In Device Manager, expand Bluetooth, right-click the adapter, select Properties, open the Power Management tab, and uncheck Allow the computer to turn off this device to save power.
Update the Bluetooth and Wi-Fi drivers together. On most laptops Bluetooth and Wi-Fi share one card and one driver package. Install the latest wireless driver from the PC maker's site, since an old Wi-Fi driver is a common hidden cause of Bluetooth stutter.
Stutter that only happens during calls is usually the Hands-Free profile, not a broken device. The Stereo profile carries music, the Hands-Free profile carries calls, and Windows cannot use both at full quality at the same time.
If it still happens
If the stutter follows the headphones to a phone as well, the headphones are the problem, so reset them and test again. If it only happens on the PC, try a USB Bluetooth adapter to see whether the built-in radio is at fault, and check for a Windows update, since Microsoft has fixed Bluetooth audio regressions in cumulative updates before.
Common questions
Why does the sound get worse when I join a call? Windows switches the headphones from the Stereo profile to the Hands-Free profile so the microphone can work. The Hands-Free profile is mono and low quality by design, and switching back and forth can stutter.
Audio stutters only when I walk away from the desk. Is that normal? Yes, Bluetooth range is short and the signal drops fast through walls and your body. Staying within a few feet with a clear path is the practical fix.
Stutter started after a Windows update. What do I do? Roll back the Bluetooth driver in Device Manager, under Properties, Driver, Roll Back Driver, or install the wireless driver from the PC maker's site, since the update may have replaced it with a generic one.