Ive seen issues posted where people out of nowhere couldnt stream anymore without getting this error. I recently bought an unmanaged switch and magically my issue went away. I went back to the managed TP-Link Omada ER605 V2.6. Issue came back. I then tried my TP-Link ax3000 and again I got real-time buffer too full. I went back to my Trendnet TEG-S762 Unmanaged switch and the issue goes away. Also there is no issue plugged straight into the cable modem. I have opened task manager while I stream to see how much data Im uploading. The managed router and switch will not let me stream at 30mbps. The unmanaged switch will. The "real-time buffer too full" error has a direct correlation to managed switches and routers not letting me get to 30mbps. I bounce everywhere between 2 and 15mbps on the managed devices while streaming however my speed test gives me a full 40mbps upload EVERYTIME. There is no speed limit set in the devices. They have stock settings. I am hard wired to each device when tested. What setting in these managed devices could be stopping me from being able to stream? When I turn the stream quality down to 15mps or even 10...still wont send it with the managed devices. Im streaming to youtube if that matters.