Internet Modem continually restarting - internet going in and out

My internet keeps going in and out continuously. The modem lights go down to just showing power, then all the lights come back on and in less than five seconds, everything is down again. When the modem completely shows full signal for those few seconds - I get a quick flash of red color in the power light and then it disappears and shows the typical white glow for signal - then back out again. This has been happening almost all day. I have unplugged my modem and waited the 30 seconds and plugged it back in twice now. Nothing is blocking the dish, we have beautiful weather and clear skies and have had good weather all day.. I still have 67% of my program data left for the month.