Originally Posted by Crowgasm
thanks for the feedback.
I do rent the modem from Spectrum. I have already tried replacing it once, which I'd hoped would rule that out. Unfortunately I'm not convinced it's not the modem, given the number of accounts I've read of people having problems with the latest generation of Spectrum modems. We'll see.
When it goes out, all the connected devices lose internet connection, not just PC2. My sense is that the NIC on PC2 might be the cause, or something about PC2's connection. I suppose it could equally be the port on the router.
With that in mind, I disconnected PC2 entirely for the last 4 days and no problems yet. Although, it's sporadic enough that this could be a coincidence.
If I don't see any problems for 2 weeks, I'll reconnect PC2 and see if the problem recurs. At that point, I will have to look at the options for checking CRC errors etc, then maybe replacing the new cable and NIC.
If the mobo NIC is going bad, is this as simple as buying and installing a PCI/PCIe NIC card and then just disabling the old NIC in device manager?
So I think his question was more to figure out if, when the loss of internet happens to all the PCs, can you still communicate with other PC's On the Network? This will give us a major clue to as the type of outage.
I have dealt with this situation before. In cases where the entire Network actually goes down, meaning not only can you not get to the internet, but you also can not reach any other computer on the network, This means you can't even PING the IP of another PC on the Network. If this is the Case, you might have already determined the issue, Unplug that PC from the Network, OR add a cheap $10 Amazon Gb Nic to it, or pull one out of another PC you might not be using, and Put it in it. I have seen Old Nic cards, particularly Old Mobo Onboard Nic's with the Realtek Chipset, cause this issue when they go bad, basically they create a feedback loop within the network. Simply pulling unplugging that PC from the network, or just unplugging from the Onboard Nic, and plugging into a PCIE one should fix the problem if that is it.
The other possibility if its the entire network going down (not just the internet) is that your Router is overheating. Asus' tend to have this issue. Don't get me wrong, I love ASUS, I actually use them at my own House as well, But I have opened them up and replaced the Thermal Pad's on the Nic Chipset, and added a cheap USB Fan to it, which does the trick. Try simply pointing a fan at it for a couple nights and see if your problem returns.
Alluded to, if it is not an Internal Network Issue, but actually just a WAN issue (Internet going down but you can still ping Internal Network Clients) then almost certainly your Modem is to blame. Swallow the $100 and grab yourself a Motorola DOCSIS 3.1 Modem, throw the Spectrum provided one through their front Window, and never have to deal with this issue again. Also, in 2 Years time you will have saved money from this purchase, as Docsis 3.1 Modems will most likely be enough to saturate Broadband Speeds for years to come at the pace we are progressing (more like regressing) in the US Broadband market.
Let us know if any of these suggestions helped. And definitely let us know if this issue actually knocks out your Local Network, or Just the Internet.