RockPI-4C WiFi ping drops

Hello,
I have problems with the WiFi at RockPI-4C. I want to stream music and videos. The WiFi drops the music stream and increase the latency. I using an unchanged image rockpi4c_ubuntu_focal_server_arm64_20201106_2350-gpt.img

  • Ubuntu 20.04.1 LTS
  • GNU/Linux 4.4.154-111-rockchip-g39b306a41b2d aarch64

Ping can be seen here: https://pastebin.com/UkAEuxCE
Boot log can be seen here: https://pastebin.com/mr4fzB5D