I'm on Windows 10 and Teamviewer 14.4.2669. I occasionally service computers of my family members and I sill experienced this issue. I then combed through the options in Teamviewer and in "Remote control" and I disabled "Record video and VoIP..." (I have a different language set up, so I tried to translate the options as best as I could) and "Play computer sounds and music" (I'm not sure if this is necessary) on both, my and the computer I connect to (for good measure). This seemed to help so far and I hope this helps anyone else too.
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