@Synth92
Try to delete Wi-Fi profile and connect to router's Wi-Fi by manually put wireless password :
https://www.tp-link.com/support/faq/918/
Try a different Wi-Fi channel on the main router, and try wireless security type WPA/WPA2-PSK, turn off 802.11ax or WiFi6 or roaming smart connect etc.
Uninstall current driver and try the chipset TL-WN823N V2:
https://static.tp-link.com/2019/201911/20191129/Driver_RTL_8192EU_TL-WN823N_V2.zip
Below is the instruction to manually install driver: https://www.tp-link.com/support/faq/920/
If problem still exists, may I know the model of router, can I have a photo of router's WiFi settings, please help check the computer motherboard info and send us the photos, thank you:https://www.tp-link.com/support/faq/2722/