@vectorx5000 

If the computer has hits own wireless card test that to see if you still get the spikes.

Reboot the computer in safe mode with networking and test the T4E.

Another user with a similar issue found out their cloud software was updating (Dropbox) in the background and didn't realize it.

@Tony 

I neglected to mention it is not a pre-built PC, but one I assembled. This is the only wireless card in it, and rebooting into safe mode with networking disables the card. I can't use any of the available workarounds to enable it, I think because safe mode disables the drivers for the card.

Once back into a normal boot instead of safe mode I looked through incoming/outgoing connections in windows firewall and tried disabling each of the connections that I thought might have an impact (like Office, Onenote) but that did not change anything. There is no network activity as viewable in resource monitor that is not a system connection, my browser, steam, and discord. I also do not have much network activity when I am trying these pings as though something is downloading or uploading. I am at a loss for what could cause this issue.

@vectorx5000 

Please install these drivers which are meant to improve the stability of the Wi-Fi connection: link

@vectorx5000 @Tony 

I contacted support who told me to download this driver:

https://static.tp-link.com/2019/201911/20191128/T4E.zip

I installed it following this guide:

https://www.tp-link.com/us/support/faq/920/

Everything seems to be working okay so far under the same testing conditions as before.

@vectorx5000 @Tony 

Never mind, I am back to having the same issue, even after reinstalling that same driver. I have no idea what to try next.

Additionally, now even restarting does not fix the issue. It just keeps the spikes regardless.

@vectorx5000 

Please reach out to our support team since the driver is not resolving your issue.

@vectorx5000

Hello,
I have the exact same problem with Archer T4E adapter and ping spikes. 
I use windows 10 and the last drivers.
Were you able to solve it?
Thanks

@vectorx5000 

Finally I tried this, and it seems to resolve it :

https://www.reddit.com/r/GlobalOffensive/comments/3ahg59/fix_for_wireless_ping_spikes/

@LOrD77 Yes, that is the same solution that I used. It's absurd that this is the fix instead of a driver change. I'll avoid TP-Link products in future.

@vectorx5000 I think I've found a fix to this problem.

1. Make sure you have installed the driver from the TP-Link support page.
2. Open Device Manager > Network Adapters > TP-Link Wireless PCI Express Adapter.
3. In the advanced tab there will be a setting called Roaming Sensitivity Level.
4. Set the value of this to Disabled.

Note: I've been using this for over a week and so far I haven't noticed any ping spikes. Before this, I used to get a massive ping spike every 15-20 seconds when connected to a 5GHz network and had to switch to 2.4GHz every time I wanted to play a game online.

This setting seems like something that a Windows update might reset so this might be the reason why many were complaining about their adapters not working properly after an update. Make sure you check this setting every time you install a new update.