Hello joegall44,

As you are facing slow speed on your modem , it looks like you need to reboot the modem on every day morning basis, to trouble shoot on that we need to check the cable signal levels .

Also, share the  screen shot  of the same, so we can check whether the cable signal levels are on the acceptable range .

Follow the below link to check on cable signals: 

http://arris.force.com/consumers/articles/General_FAQs/SBG8300-Cable-Signal-Levels