Modems shouldnt go down unless theres an absense of lights to them or if one of the lights is blinking that shouldnt be
What you said is close to what my modem does. When it messes up, the modem logo on my router flashes. Then I have to unplug it. But it reboots all by itself sometimes. I need to get a new modem soon.
All the lights stop blinking, they're just static. First, the light that is for power is the only one that is on. Then, all four lights are static. Then they go back to blinking per normal.
The modem is close to dieing. WOW! might have some new modems that I want.