RTSP strem suddetly freezes or updates only every 10 second

[Biavleren]

A raspberry pi 4 is running go2rtc and cathes the videofeed of 4 RTSP cameras. It functions probably on same network, but recently started to freeze the images or only update image every like 10 seconds, when using WAN to access the streams. I have tried the newest version 1.9.14 and also version 1.4 which was the current version when i found this awesome software - same result.

My setup is x number of cams that outputs rtsp which is converted to WEBrtc to be displayed as embeded videofeed on a website.

I have attached a stuck image:

The info snippet:

Any idea where the chain breaks?

[AlexxIT]

So, the stream works fine on the local network, but freezes on the WAN.
Sounds like usual packet loss.
https://github.com/AlexxIT/go2rtc/tree/master/internal/webrtc#webrtc-server

[Biavleren]

Thank you for the response AlexxIT!
The goal is to use webRTC. Yesterday I tried to force the stream to be MSE, but unfortunatly it was the same behavior with freezes etc. I am thinking if I can get the MSE to work problably, then I dont have to think of dealing with "upgrade" headers etc for the webRTC. Do you have troubleshooting material for the MSE too? again, thank you for building this nice project!