Hello yaidier,
Welcome to Apple Support Communities!
We want to help make sure your Bluetooth headphones are working perfectly after the update. First, let's have you check for possible sources of interference: Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
Next, let's check these steps from If a Bluetooth headset doesn’t work with Mac - Apple Support:
" •Make sure the headset is turned on and in range.
•Make sure the headset is connected with your Mac. Choose Apple menu
> System Preferences, then click Bluetooth
. Check to see if your headset is in the list of devices.
•If your headset isn’t in the list, try connecting with it again. See the documentation that came with your headset for information about connecting your headset with your Mac.
•Make sure your headset is charged or has fresh batteries."
You can figure out if unexpected behavior is related to a user file or setting by trying to reproduce the issue from another user account. This process includes creating a new user account, logging in to it, and testing for the issue.
Set up users, guests, and groups on Mac - Apple Support
Lastly, you can reset your headphones using the steps from page 7 of the Soundcore Life Q30 User Manual here: Soundcore Life Q30 User Manual
"You might need to reset your headphone if you experience any connectivity problems or function issues. Press and hold the power button and volume up button simultaneously for 5 seconds until the LED indicator flashes blue and red alternately twice."
We hope this helps to resolve the stuttering in sound.
Cheers!