Hi, that sounds like the issue that’s been plaguing Foundry since the introduction of the feature. You can read all the gory details here : https://gitlab.com/foundrynet/foundryvtt/-/issues/2116
but the short story is that there is a bug in the underlying webrtc library which causes it to not send data sometimes for random reasons even after the connection is established.
My suggestion is : Install the Jitsi module (no configuration would be needed), which will use the Jitsi library and the jitsi public servers to establish the audio/video call. It will have less incidence on your bandwidth and cpu usage too, so that might help too, but you won’t have the problem you’re describing.
For more information about the difference between how the Jitsi module works and the core Audio/Video, you can read this post here : Audio/Video conferencing
I hope that helps.
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