Network Connection drops when Transferring Large Files

If I am copying a file from my PC to the NAS, I'll lose the connection to the NAS (and it will reconnect on its own).

Likewise if I am copying a file from my PC to a second PC on the network, I'll lose the connection to the second PC temporarily.

What ever is the target of my file transfer is the device that is temporarily lost (thus stopping the file transfer).

And when the bad PC is on Ethernet, drop or no drop?

It will drop although, it takes more "effort" (i.e. multiple files being transferred at once - as opposed to in succession).

Keep in mind there may be mulitiple issues but some routers buckle and drop under heavy use. I can't find which router, model, firmware version to check it out but try updating your router to it's latest firmware then try the usual settings.

It's in the CNET Forum sticky but in short, router latest firmware, router defaults then change the SSID and set the security to WPA2 AES personal security. Nothing more.

Again, I'm shortchanging you here about routers that do this when filters and firewalls are turned on.
Bob

That makes sense, but my router is an Asus RT-AC68u.(from what I see, it should be able to handle a decent load).

I did update it to the latest firmware, and I have my security set to WPA2-AES as you suggested.

I'm just can't think of anything else to troubleshoot other what I mentioned above.

"NOTE: The Firewall feature is enabled by default."

This can cause all sorts of LAN oddities. The more I read the manual, the more I see the defaults are not that great.
Bob

I did see that and turned off the firewall? Did you see any other defaults that could contribute to this problem?

In the forum stickies. For me when I see issues I try the defaults, turn off the firewall as a router is a natural firewall from the internet and we don't want to firewall inside our LAN (unless that is our goal?)

So pulling back to 802.11g or just getting wired is among the rest as well as dropping the MTU to 1492 (see the web on that.)

There is nothing specific that will just cure it. I swap routers all the time as any router with defaults that cause issues are a good source of return calls which is a bad thing.
Bob

with your router settings. I don't see your model so can't tell whether your router has the capabilities but try this:

Change from 11ac to 11a (or 11n at 5GHz only). Your PC adapter will auto adapt to the same speed once you connect to the SSID. Sometimes a slower transfer with larger bandwidth helps.

WiFi and Powerline have more difficulty with large/long bit transfers than wired. Sometimes the buffering for error corrections fills up and it crashes. And WiFi and Powerline are subject to more interference than wired. If you need to access large files often, go with GbE.

Good luck.

check "inactivity" settings.