Router - intermittent outages the past 24 hours

I'm experiencing intermittent outages and my router resets - lights go to flashing green then back to white and it works again.  It lasts anywhere from 5 to 30 minutes.  It effects all devices, even hard-wired devices.  I've rebooted the router several times, along with the hardwired desktop computer.  When it comes up, it works great.  I tried working with the xFinity chat, but that is pre-canned and worthless for this problem.  I need this fixed quickly please; I use the internet for work.  The ironic part is, I'm a software engineer for mostly back-end network infrastructure and my internet is having problems.