drops wifi constantly

Hi.  I have the c3000 router/modem.  I keep losing connection... sometimes after 5 seconds of doing a power cycle , sometimes 5 minutes, sometimes 5 hours.  The internet is fine, good connectivity, and can hardwire to internet.  WHY is the modem pooping out all the time???  It's making me crazy having to go thru power cycling 87 times a day to get work done.  My cable/internet supplies 2.4 and 5 ghz.  This modem is 15 months old.  Thanks alot for any advice or suggestions on how to remedy this problem.