C7800 security

[BNitschke7]

My router appears to be getting hacked and my Xfinity internet data is getting used up. I’ve changed the password on the mobile app as well. Need some suggestions please, thank you.

[plemans]

Other than the data being "used up" what makes you think its been hacked? 

How much data are you using? 

How many devices are connected?

Do you stream a lot? or how much streaming is done?

Do you have kids/family members in the home?