Currently only have 4/8 upstream channels bonded. Cox Tech told me to get 24x8 for Ultimate Internet. What do I do?

I am getting the full 300 and most of the time well over that (sometimes up to 450 ) but my issue is random drops in connectivity. I checked my modem logs and to be honest I have no idea what all the stuff means but I see things like critical and warning and timeouts etc. So thats when I called cox and spoke with support. Truth be told, I don think she had any idea what I was asking about. 

But I'm willing to bet someone on here does! Any thoughts/advice/help would be very much appreciated!