I have two Chromecast 4Ks. Neither have this issue. So it is either a faulty WiFi antenna, just a faulty device in general, or the signal is weak where the device is located.
Jellyfin 10.10.6 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)