Zoom freezes on Ubuntu 20.04.3 LTS

So, I installed Ubuntu 20.04.3 LTS on a new Lenovo E 15 Thinkpad and I'm experiencing issues with Zoom. Every time I join a new meeting the video freezes after some time (usually a couple of minutes). I can still hear other conference participants, but my video remains frozen and I have to restart Zoom (until it freezes again after some time). So basically, I am not able to use Zoom on my computer. There have been no other video-related problems until now. I have been using other video conferencing tools only in the browser though. (Using Zoom via the browser is not an option btw.)

System information:

$ sudo lshw -C display
*-display                 
       Beschreibung: VGA compatible controller
       Produkt: Advanced Micro Devices, Inc. [AMD/ATI]
       Hersteller: Advanced Micro Devices, Inc. [AMD/ATI]
       Physische ID: 0
       Bus-Informationen: pci@0000:04:00.0
       Logischer Name: /dev/fb0
       Version: c1
       Breite: 64 bits
       Takt: 33MHz
       Fähigkeiten: pm pciexpress msi msix vga_controller bus_master cap_list fb
       Konfiguration: depth=32 driver=amdgpu latency=0 mode=1920x1080 visual=truecolor xres=1920 yres=1080
       Ressourcen: iomemory:40-3f iomemory:40-3f irq:42 memory:460000000-46fffffff memory:470000000-4701fffff ioport:1000(Größe=256) memory:fd300000-fd37ffff

OpenGL core profile version string: 4.6 (Core Profile) Mesa 21.0.3

Any help would be really appreciated! Thanks in advance!