Internet

I've restarted my modem countless times in the past few days. My xfinity internet appears to work for 5 maybe 20 minutes if it feels like pushing itself before leaving me stranded in a world without internet. Xfinity also ironically billed me the usual $40 a month that I pay for the internet that I dont have. Explain to me how that works. Anyways, xfinity is cheeks.