My videostream premium would also buffer exactly every 5 min (even to unpause) no matter the type of file. After some troubleshooting, I found the problem to be the software, as I am now using another streaming app flawlessly. I suspect that Windows 10 updates may have been the culprit, since I noticed a major update shortly before my issues. I am assuming that the problem will be patched eventually. I really did like videostream, but until they fix this I will obviously no longer be using the program.
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RE: [Developer Post] - Stuttering + Buffering + Lagging Help Thread!