Hi, friend!
We do apologize for the inconveniences that you are encountering recently. May we know does this issue only happened recently or it's been like this from the start. However, kindly check if the data usage limit has been set and you may adjust it:
1. Connect your computer to the router's Wi-Fi network (or connect the computer to the router's LAN port using an Ethernet cable). Open your Internet browser. Enter 192.168.8.1 in your browser address bar and log in to your router's web-based management page.
2. Choose Tools > Statistics and click.
3. Set the data usage limit and click Save.
Thanks!