Hi Grooty12,
Thank you for reaching Microsoft Community.
Please follow these steps below to troubleshoot the issue on your Surface Headphones 2:
1: Check if the correct audio profile is selected
Click the Audio icon on your Taskbar (if Windows 10)
Select Headphones (Surface Headphones Stereo) if listening to music
Select Headset (Surface Headphones Hands-Free) if making phone calls
2: Check the Equalizer if it is changed to a setting that may caused the issue
Open the Surface Audio app then choose Equalizer
Under the Equalizer, try to change the preset to Flat
3: Restart the app or audio source
**** Close the application that is being used as the audio source on the host device and then open it again.
4: Try turning off the headphones then back on
5:Update your Surface Headphones 2
Refer to this page to Update Surface Headphones
6: Reset your Surface Headphones 2
**** Refer to this page to Reset your Surface Headphones 2
7: Pair with another device
Please try to pair the Surface Headphones with another host device and see if the issue still occurs
If still the issue persist after the steps above or the issue also occurs on another host device, please contact support through this page: Contact Us or through our Global Customer Service phone numbers to check for options available and for further assistance.
Hope this helps.