Hello again. Please Open Command Prompt as admin, type sfc /scannow, let it finish, then run DISM /Online /Cleanup-Image /RestoreHealth. These check for and repair corrupted system files, which fits a problem that keeps getting worse over time.
Also check Device Manager (right-click Start, Device Manager), expand "Sound, video and game controllers," right-click your audio device, and try "Update driver" then "Search automatically." If that doesn't help, right-click again and check "Properties > Driver" for a "Roll Back Driver" option, useful if this started after a Windows update.
One more: restart both Windows Audio and Windows Audio Endpoint Builder services together (services.msc, right-click each, Restart), since they work together and a mismatch between them causes exactly this kind of gradual glitch.