Windows 10: Every time I download a large file, my pc always comes up with an error on the WiFi card

Title, it either says that the default gateway isn’t accessible, or that the diagnostics policy service isn’t running, and I’ve turned off the thing in the settings that allows windows to turn it off to save power, and I’ve checked that my drivers are updated.

:)

 

Wifi card suddenly stops with no error

(note: restarting the laptop fixes this until it happens again) this is something that happens randomly, I'll be doing something (usually requiring internet) and all the sudden the wifi card disappears from the connections list. I cannot see why this happens and it seems to happen randomly with no pattern. Opening device manager to the wifi card says that it has an error code 14 and that I need to restart to fix it, if I go the the details tab under Status I get these messages

and under problem code I get this

this is fixed by restarting but this happens 2-4 times a day and gets really annoying

 

Downloading Large files

Here is a technique, I would use if I were in your position. it's a lot of work but if SERIOUSLY DO NOT HAVE ACCESS TO WIFI, this is the way to go.



You probably have a friend who has another phone. It could be android or windows phone. Put your SIM into the second phone, and turn on internet sharing. Turn on your windows phone, connect to the Wi-Fi that is now coming out of the second phone. Technically,
you are still using your own cell phone connection data, except that it is coming as Wi-Fi from the second phone.

 

Why do large downloads bring my PC to a halt?

My problem

Whenever I download a large amount of data (ex: downloading a game from Steam), my entire PC comes to a crippling low <1 frame per second, despite having relatively decent hardware. This only seems to happen with large downloads as I can download single images and webpages without issue. To make matters more confusing, this issue used to not be present on this machine prior to being upgraded to Windows 10 (from Windows 7 Home) as well as potentially for a short period afterwards that I don't recall the issue occurring. Another thing to note is that I do not have WiFi in this computer, only Ethernet.

My question

What is the cause of this poor performance I am experiencing and how do I fix this?

My theory

It would seem that Windows insists on downloading large downloads on the first core listed in task manager every time. This is supported by this screenshot of Task Manager that I took while downloading a game:





Processes running while downloading a game:





I do not know if this is the intended behavior or if it is actually the root of the problem. But so far I don't have any evidence that disqualifies it.

Things I have tried

• Updating my Ethernet driver (Realtek PCIe GBE Family Controller) multiple times
  
• Adjusting my power plan
  
• Making sure Windows is up to date.
  
• Using latencymon to investigate driver latency. It frequently shows massive latency with ndis.sys (when downloading files) that I have been unable to resolve. I assume this is related in some way.
  

My relevant system specs

• Windows 10
  
• AMD FX-8150 CPU
  
• GTX 1060 6GB GPU
  
• 16 GB 1600Mhz DDR3 RAM
  
• Multiple drives (boots from a 256GB Corsair SSD)