I emailed Charter....
"I'm having problems downloading any files over 400 Megabytes. I used to not have any problems in the past, but for the last two weeks or so, I will be downloading any file over 400 mb and it will go fine until I get to 400 and then the transfer will time out. At first I thought this problem was on my end, but after searching several different forums online, there is another customer of yours that lives in the same town as I do having the exact same problem as me. I've chatted online with one of your techs and he said everything's fine on your end. And your other customer having the same problem as me had Charter come out to where he lives and troubleshoot his connection and everthing turned out fine. I used to never have this problem, until about two weeks ago. So I ask you, what have you changed in the last two weeks? Please help. Thank you."
I'll let you know when they reply.