1 Network works terrible while other doesn't

[gator321]

We have a 2.4GHz and a 5GHz network for our internet, My family always used the 2.4GHz, slowing it down for me, so about a year ago i started using the 5GHz connection, And it always was WAY more consistent, as in i would never get any connection issues. Recently the 5GHz connection would disappear(i fixed that part) but now i can connect to it, but its speed is only 0.41 Mbps when i'm supposed to be getting 28 Mbps, When i connect to the 2.4GHz one, i had 28 Mbps (but i can't stay connected to it for long because of all the devices my family connects to it on.) which makes it unplayable. Both the 5GHz and the 2.4GHz are provided in the same package by same providers, Who we called and said that the speed, router, and Modem are all working fine. I thought it was my computer, but i have tried everything in my knowledge.

List of things i have ALREADY Done:
*Restarted computer, router, and modem.
*Reinstalled Steam, Uplay, and all of my games.
*Ran a virus scan
*Disk Defrag and other cleaning processes
*Checked for any programs that might be trying to "Control" my Bandwidth
*Update, Reinstalled, Disable/Enable all of my drivers for literally every hardware in my pc
*Changed Most of my Advanced settings as instructed by other threads alike mine.

MY RIG:
GeForce GTX 1060 6GB
Intel(R) Core(TM) i5-4460 CPU @ 3.200GHz
8 GIGs of ram
1920 x 1080 60Hz

NETWORK ADAPTER:
TP-LINK 450Mbps Wirless N Adapter

The 5GHz network has worked in the past, so please don't say i can't support it. THANKS! (been having issue for 5 days now, gaming addiction is driving me crazy)

 

[gator321]

I haven't fixed it yet, but i have made it less broken, I got it to 9 Mbps, instead of 0.41, BUT it is still unplayable, and i can't make it an entire game of siege before i get kicked for having too slow of a connection
Bump?

Edit: it gets up to the speed it needs to be at, but only for 3-5 minutes , then it kicks down to 1-4 Mbps. This issue is so weird, i have no idea whats wrong

 

[anon7mous]

I had the same problem. I had to to uninstall all my netowork drivers using device manager and install the new ones. I would suggest downloading the newest driver from your manufacturer's website.

 

[gator321]

I had the same problem. I had to to uninstall all my netowork drivers using device manager and install the new ones. I would suggest downloading the newest driver from your manufacturer's website.

As stated above, i have already done this.