Extreme increase in data usage

Hi Broaini, allow me to highlight a few things that may account for the spike in data usage. Since you performed a factory reset on your router, be sure you've changed the network name and password. Have you had any recent house guests who may have utilized your home network? Have there been any changes or activities in the household that could lead to additional usage like streaming music, streaming video, or online gaming? Even if you're not actively watching online content, the device could still be streaming, which counts toward your data usage. Check all the devices in your home for virus, spyware, and malware. Spyware running in the background can cause sudden spikes in data usage. Our computers and mobile devices may be sending or receiving data even if we are not actively using our internet service. Do you have internet-connected cameras tied into your home security system? Using third-party home security services over your in-home WiFi network and security cameras accessed over the web cause an increase in usage. We often overlook how often devices update apps or how often our devices upload things like pictures and videos to the network cloud. For example, a computer could be automatically downloading operating system updates, security software updates, and application updates like iTunes. On each of the computers and mobile devices in your home, disable all automatic backups, automatic updates, file sharing software, mobile app updates, and app syncs between your mobile devices and your network. -Becky, Cox Support Forums Moderator