Can you confirm that the only device plugged into the modem's LAN ports is the DIR-655? Anything else? Also, the modem is running in Bridge mode, correct?
Fwiw, that router is pretty old by today's standards. That's one of the few routers that never had any firmware upgrades from what I remember. I used one of these until buying an Asus RT-AC68U.
Nice that the supervisor tech called. Looks like whatever it is, its a neighborhood issue, so, not just you alone. I'd wait until the maintenance crew has a chance to check things out. I'm running the CGN3ACSMR in bridge mode with the RT-AC68U as the router. I've never had any issues with it and there are others on the forum who run that modem as well.
Looking at the D-Link site for the 655, the last firmware update was three years ago, so, thats been a while. There have been security incidents occur since that time where manufacturers have had to release firmware updates, so, that is something to think about.
http://support.dlink.ca/ProductInfo.aspx?m=DIR-655
@Fr0stByte72, you're the third person in the last few days to see this. Take a read thru this thread, now that your post has been moved here. I wonder if you're in the same area as either of the others in this thread. Your particular instance where a network fails, either the LAN or 2.4 or 5 Ghz networks has been seen before as well, and in every case so far, the problem has been tracked down to a faulty adapter on the remote device. Taking that approach, if you isolated the LAN devices, one at a time by unplugging them from the LAN ports, you might find that one of those devices has a problematic ethernet port.
What you might find is that plugging in your router to the modem and then running all of the LAN devices off of the router might stop the failures altogether. Its possible that the router is more fault tolerant than the modem.
