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Ubuntu 20.04 sporadically muffled voice audio

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On new ubuntu 20.04 and new lenovo x1 carbon gen 9, the sounds works ok. However when it come to voice call, the voice muffled randomly for a second, and come back. it make taking conferences or call impossible.

Any idea how to fix this ?

inxi -SMA
System:
  Host: x1 Kernel: 5.10.0-1052-oem x86_64 bits: 64 Desktop: Gnome 3.36.9 
  Distro: Ubuntu 20.04.3 LTS (Focal Fossa) 
Machine:
  Type: Laptop System: LENOVO product: 20XW00A9US 
  v: ThinkPad X1 Carbon Gen 9 serial: <superuser/root required> 
  Mobo: LENOVO model: 20XW00A9US v: SDK0J40697 WIN 
  serial: <superuser/root required> UEFI: LENOVO v: N32ET71W (1.47 ) 
  date: 09/06/2021 
Audio:
  Device-1: Intel driver: sof-audio-pci 
  Sound Server: ALSA v: k5.10.0-1052-oem 
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