Internet goes out at 5:00am every morning - Errors in modem log

@andyross​ No, we have not.

@flatlander3​ This happens every single day EXACTLY at 5:00am.  When you say "signal power overloads the receivers" and "pushing too much upstream", that doesn't seem like something that would happen at the exact same time every day (especially at 5:00am, when nobody is using the Internet).

Also, if the modem were rebooting, it should come back up and work correctly on its own.  In fact, rebooting the modem manually is the only way that we can get the Internet back up and working after 5:00am every morning.

Regarding connectors, we did have a Comcast tech come out.  He checked all our connectors (and even replaced one of them), but it did not resolve the issue.

@jmartine​  You don't have to look at it if you don't want to.  If you got marginal signal issues in the first place, its not going to help other issues.  Signals drift over time with cable distribution.  It's not fiber where it either works or does not.  This problem can be upstream from you or in your house.  Could be temp/expansion even water/moisture related. 

You can have comcast look at it again.  If it's house wiring or splitter issues in your place, you pay.  If it's upstream from your house or a plant problem, you don't.  That link is where I'd start if I were having cable issues.

@flatlander3​ I will check the power levels as that link suggests.  However, I am very skeptical that the issue is due to things like temp/expansion/water/moisture, either at my house or upstream.  The reason is because this happens at EXACTLY the same time every day (within 20 seconds of 5:00am).  If it were due to one of those things, it would happen more intermittently (multiple times per day, and the time of day would vary by more than 20 seconds).  Weather just isn't that consistent.  Some event is happening on a very regular schedule at 5:00am every day.  I don't know if it's something that my modem is doing, or something that Comcast is doing every day at 5:00am.  I also don't know why the modem doesn't recover on its own, and requires a manual reboot every single day.

@jmartine​ What happens in every neighborhood starting 5am?  Power draw when the world turns everything on.  Sometimes you can even hear it as interference with an AM radio.  You can certainly pick it up with a shortwave. 

Got bad connectors?  Splitter?  Powered amplifier?  Kinks/Bends in cables?  It's a noise injection source.  Best is just a straight cable run from the modem to wherever the cable comes into your house.  It's supposed to be grounded too.  If you are marginal in the first place, any drift/noise can be enough. 

If it's that regular, you got it easy.  Look at the line signals at 4:50 AM.  Verify it is working.  Now look at the signals at 5:01 AM.  What's different?  What are the lights doing on your Netgear before you reboot?  Are you doing a reboot with software or powercycle (physical cord yank).   Believe it or not, a couple of dB in signal power can make a big difference if you're on the edge in the first place. 

The error logs might tell what it is doing as well.  Are you having DHCP or DHCPv6 lease issues?  They tend to renew at fixed intervals.  Look at the networking page on your Netgear.  Is it getting an external IP address when this happens, or sitting there trying to acquire one?  

Just some basic troubleshooting.  Might not be at your house at all.  Could be upstream.  Just stuff to look for.