Internet upload speeds is unbearably slow a night time.

So I have been a Cox customer for over a year now and I haven't had any issues with this company ever in my life, but that all of the sudden changed pretty drastically over the past couple of months. We pay for 100mbps download and 10mbps upload. Usually we get these speeds if not better every single day. However, at night time, our download is dropping to around 20mbps which is actually fine with me, I have used much worse download speeds in the past and made it work just fine, but the upload, oh boy the upload, it drops to around 0.2-0.7. Yeah you read that right. This is an extreme issue for me because I do a ton of gaming, and most of that is done at night since I work and go to school during the days. The reason this affects gaming so drastically is because it introduces a ton of input lag making it seem like I have an incredibly high latency when I dont at all. My latency averages around 19ms but I will unable to play due to such a long response time. Almost every single night at around 10-10:30 pm the internet drops from its regular speeds down to the ones I listed. I have called at least 3-4 times regarding this issue, and the response is always the same. I had a tech who was supposed to come out the other day but I had to cancel due to the fear of being charged the 75 dollar service fee, which I am certain I would have been charged for because this problem only happens after 10 and he was supposed to come between 5-7. Honestly this problem is getting out of hand for me. Has anyone else ever had an issue like this with Cox before? I hadn't had any issues until after the whole net neutrality thing happened, and im not saying thats what this is, but it's sure funny to me.