I know this was from Feb, its now July. But I wanted to see if you ever found out what was the issue or if you're still having this issue? I stream as well and have done everything and more that you have done. I too have had less than 2 upstream, most of the time between 6pm-5am. my download remains the same and all my db levels are perfect. Had a tech out and didn't find the issue. Another tech will be out in 2 days, I've been nonstop trying to figure this out around the clock. I have the sb6141, we(comcast tech and I) have tested other modems and no change.
My OBS has over 40% dropped frames and I consistantly sit at 1400 kb/s or lower. It's been an ongoing issue for 2 weeks now, before I was running 20 mb/s upstream vs my 0.5 - 1.5 mb/s now.
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