org.jitsi.videobridge.EndpointMessageTransport.log() No available transport channel, can't send a message

Hello,
I don’t know if this line is the log of my problem but jvb log a lot :
org.jitsi.videobridge.EndpointMessageTransport.log() No available transport channel, can’t send a message

Sometimes the sound and videos stop working.
Sometimes the sound disapear only for some participant.
I can hear my 1st friend but i cant here my second friend and my second friend can here me and my 1st friend.