Try the following steps to resolve your issue:
Poor sound quality from a Bluetooth® device
Applies to:
Your Bluetooth® device may be out of range. Try moving it closer to the Bose® SoundLink® Colour speaker
Move your Bluetooth® device away from any device that generates electromagnetic interference, such as another Bluetooth® enabled device, cordless phone, microwave oven or wireless router
Reduce the number of applications running on your Bluetooth® device. Running multiple applications can reduce the amount of internal resources available to transmit audio. Closing non-essential applications may improve audio quality
Try turning off Wi-Fi® to improve audio quality
Try clearing your Bluetooth device from the Bose® SoundLink® Colour speaker by disabling Bluetooth on your device. Pair the device and speaker again
Turn the speaker off and back on
If your Bluetooth® device is in your pocket, try placing it in open air, without your body between the device and the speaker
Disable Bluetooth on other connected devices that are not currently in use. Audio may drop out if a second connected Bluetooth device goes out of range of the speaker
Try resetting the speaker. For more information, see Restoring your system's factory settings
Check for updated software for your Bluetooth device and the Bose® SoundLink® Colour speaker