I'm in the same boat. I was fine on data usage for 17 years then in Dec. '17 I noticed it was headed thru the roof so I bought the extra 500 GB plan late Dec '17 for 30 bucks as a pure panic shot as I ended up with 1229 GB usage. I then complained in early Jan '18 to Cox support that our viewing and usage habits don't change day to day. We are two retired seniors with pretty consistent daily usage habits. After calling twice to complain about the alleged "artificial" overage, the Jan usage did finish barely under the 1024 GB limit at 993 GB. Feb was even lower at 681 GB but still the data usage meter on my AC2300 Netgear router is about 30% lower day to day than the Cox meter. March also came in under the 1024 GB wire. However, with the new billing cycle starting on 3/25 I was at 34 GB for that day, however the day before I was at 11 GB. 3/26 and 3/27 jumped to 26 GB. Again, our usage habits are the same day to day. This wild data fluctuation is just impossible! I guess there is no resolution, fix or any agency that will speak for the customer. So, I will continue to call Cox support, point out the discrepancies and hope for the best.