SB1641 and Premier Package issues?

Afternoon,

My question is what to do about our internet dropping to no signal or 1-2mb every other day?  We average 23-33mb download, 3-4mb upload when the internet is up.  We have premier, are running a Motorola SB1641, Mac time Caps router, and all Mac computers.  We have had cox techs out, and we are still having the issue.  

Doing this every other day, spending an hour or more unplugging, resetting, and calling Cox is lost time and money and we are about fed up and ready to change service...  Is this a modem issue, firmware?   Every time I call the support line, the automated lady transfers me to a tech because theres an issue, the tech has us reset it 2-4 times, some techs are awesome, some need new careers, then it comes back up after 10-15 minutes, fast connection again, then they tell me its our Macs, which don't have an issue at the office, running 50-60mb all day without an issue wirelessly or using a hotspot on go.  When my Iphone5 on cellular data can load faster somedays, I am in need of help here!! 

Ideas, suggestions?  Should we get a different modem, is ours not supported and causing communication issues?  It's working great right now, in 10 minutes, might be zero...

Thanks,

Taco