> might be a software issue If your usb wifi card is an ar9271 then I can tell I have several usb ar9271 wifi cards. One nano size. One having a 4inch antenna. One having a longer antenna. At distances about 10yards from the router they are all equally fast and seldom disconnect. That is on a debian 10 main distribution and the software package in question is firmware-ath9k-htc 1.4.0-97-g75b3e59+dfsg-3.
I also have trisquel 8 64bit installed on a hdd. But I do not use it. I mainly update trisquel. I have not experienced problems about ar9271 running on trisquel. I suggest, it is something about your software or hardware. Can you test your wifi card on other routers and computers?