Internet speeds randomly drop throughout the day.

So a few days have passed since the Cox tech showed up and he said everything looked good. He was confident that the issue was a splitter on the drop for our line that shouldn't be there... I told him I don't really see how that's effecting anything because the power levels on my modem are fine but he insisted. He left and the next day the issues start again with the internet constantly dropping out randomly for minutes or seconds at a time throughout the day maybe once or twice every hour. My connection stats are below and this is happening as I type this. Not sure how else to handle this. If I complain to Cox again they are just going to want to send another guy out so what can I say that will help them figure this out. The last guy busted out his speedtest.net results and tried to use that to show me that my connection was fine. Its like he didnt believe that anything was actually happening even after I showed him pictures of speed tests when the problem was going on.