New
#31
"Because the router and the computer are separated by 2 distant rooms"
I hear you. That is why I also carry a 100 ft. Ethernet cable so I can at least get things setup and running when called for.
Do you have both an ISP router and an additional wireless router?
If you have an additional wireless router, update the firmware.
I just had a computer using a TP-Link USB adapter behaving just like you are explaining
The owner had a Netgear wireless router that hadn't been touched since he installed it 4 years ago and updating the firmware worked for him and he's still using his TP-Link
EDIT: There have been times I have had to bring the computer over to where the ISP router is.