since a couple of weeks I have a problem with my internet connection via TL-WDN4800 and no idea what might be the actual problem:
I installed the device like 5 months ago. It worked fine so far but since 3 weeks the connection is extremly slow (almost modem slow if speed tests are showing correct results).
I tested Wifi connections on other devices (smartphone, laptop) but have not found any obvious issues everything seems to be fine. And I tried to reinstall Win7 Pro but it didn´t help, connection is still slow.
But then I booted with Ubuntu and tested the connection again and now connection is at "full speed". Since the card seems to work fine on Ubuntu I assume the problem is Win7Pro, but why did it work for a 5 month an then suddenly stops working? I have not changed the system or modified any settings or wahtever and why is it not working again after clean re-install of Win7Pro?
I would be very thankful for any idea on how to fix the problem. I have no idea where to start for looking for the issue.