Equipment: RPi4 running LE 10.0.2
I had a peculiar streaming video buffering issue. I would be watching video addon #1, then switch to video addon #2. After switching to video addon #2, any videos selected for viewing would have terrible buffering. Rebooting LE would fix the problem.
The reverse was true as well. Switching from video addon #2 to video addon #1, video addon #1 would experience terrible video buffering. Rebooting LE would fix the problem until I switched to a different streaming addon.
After a lot of troubleshooting, I determined that the root cause was in LE.
Solution: For some unknown reason, the networking setting of LE was using both the wired connection as well as the wireless connection. I turned off the wireless connection and used only the wired connection. The video buffering issue went away. While I have not verified this, I suspect that unplugging the wired connection and using the wireless connection would have fixed the video buffering issue as well.