@inakijac 

Hello, thanks for reporting the issue to the community.
1. Is the model number of your wireless adapter T2UH, and is hardware version V2?
2. What is the operating system of your computer, a Windows 10 or mac? If it is a Windows 10, try to delete the existing driver and update the driver to the below one:
https://static.tp-link.com/2019/201911/20191128/T2Uv2.zip

If this doesn't help, please check the below further:
1. Is it possible to try this adapter on another computer and confirm if the issue persists?
2. Is there any anti-virus software running on the computer? Can you please try to uninstall it and see if that makes a difference?
3. It is suggested to try to change the wireless channel and channel width on the wireless router, which may help to improve the wireless connectivity and range. BTW, what is the model number of the wireless router that this T2U connects to?

If none of the above helps, please refer to the below article to review all the settings in your network and get back to us with the required info, then we will try to investigate further:
https://www.tp-link.com/support/faq/709/