Fluctuating Upload Speeds

Oh cool, found some info about my upload issues as well. Mine started earlier this week and has been ongoing ever since. Had a cox tech come out today with his gear and determined there are no issues with the line and the up/down speeds are completely fast. 

I ran a test stream on OBS and about 1.5 minutes in, it dropped to zero and he tested it at the same time with his box while this was happening. On his box, the up/down speeds were consistent with no issues. 

I have a log of speed tests that show subar upload speeds at different times. My down speeds are always pretty consistent. It's just the up speeds with the issues. The tech checked on the outside lines and made sure everything was nice and tight and we tried again with the same results. He also checked the node and didn't see any issues. 

So friends, could our PCs have had some kind of  update that could be causing these issues? Some kind of firewall or network software that is preventing normal speeds? I have my PC hardwired into my modem and have def replaced the modem and even went as far as upgrading my internet package, but the up speeds are still intermittently kaput. 

Forever trying to find a solution.