I’ve moved your post over to the #support:nucleus-support section so we can help you out.
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Are all tracks stopping every time? Only some tracks? Does it happen for all endpoints?