Windows 10: Download speed drops to 0/kbps after a few seconds when downloading large file on any browser

Download speed drop to 0B/s with every browser with Ethernet and USB WiFi but my other device works perfectly fine it's just this specific device.I can't download large files from any browsers, every time the download starts and after a few second the speed drops to 0 B/s and it says "Download Failed- Network Error" and when I try to play GTA online I get stuck in the clouds or when I tried playing slither.io I'm also stuck in the loading screen but it gets fixed until I use a VPN, other games like CSGO, L4D2, Enlisted, Starwars Battlefront 2, Fortnite, Roblox and Valorant works fine

:)

 

Browsing speed is fast, but download speed is 0

I'm currently using Windows 10 and netcomm nb604n router.

Problem:
Web browsing on chrome/edge/firefox works fast, but my download speed from majority of websites start around 10kb/s and eventually (in a few minutes) decrease to 0kb/s.

Here are some example files that does this:
https://atlas.hashicorp.com/laravel/boxes/homestead/versions/1.0.1/providers/virtualbox.box
Git for Windows (there is a download button)

When I am downloading from utorrent, or when I installed the Unity engine through Unity's installer, my download speed was fine.

Things that I have tried:

1. Running the test on speedtest.net. It says that my download speed is 18MB/s and upload speed is 1Mb/s. Of course this doesn't demonstrate the actual speed that I'll get when downloading/uploading from a server, but my ISP is using this to say that there is no problem on their side.
   
2. Taking my router, filter, and all cables to another house and downloading the same files that I couldn't download. This worked perfectly fine, so I'm guessing that my equipment is not the issue.
   
3. Using both wireless and LAN on a brand new computer and an old laptop. The problem exists in all cases.
   
4. Resetting and restarting the router. Did not do anything.
   
5. Changing the mtu settings as suggested on Windows 7, download speeds drop to 0 kb/s and the download has to be restarted
   Unfortunately this didn't solve my issue.
   
6. Calling my ISP to make sure that they weren't throttling my network. They are denying any fault on their end, and are claiming that there is something wrong with my computer or my router but refusing to provide a solution.
   

If anyone has any suggestions or ideas on what I could try to resolve this issue, please let me know!

 

Download Speed Question

Is there a reason as to why my parents are paying $40 a month for 7 mbps download speed, and the maximum download speed we have ever experienced on a file is ~ 870 kbps?

 

Download speeds dropping on Windows 10

My internet speed was a couple kilobytes per second, so and I got some help to fix it(changing the speed and duplex of my wired connection) but a couple seconds later, my download speed went from 10 mbps to 300 kbps!

Any help?