Wi-fi, I have already tried re-installing the driver
K if you haven't tried already unplug the router and leave it off for 5-10 minutes (lets it cool down a bit), plug it back in and see if the problem persists.
If it does here's some more troubleshooting to try
In device manager, select the wifi card under network adapters and right click. Select properties and go to the power management tab, uncheck the "Allow this computer to turn off this device to save power" box and see if that helps.
After that I would check for some corruption, it was pretty common during the 8 to 8.1 upgrade and happens on the 7/8.1 to 10 upgrade.
Open CMD prompt with admin privileges and type in sfc /scannow
if it says no problems were found then no windows corruption , if said it found corruption and fixes it then your good. If it says it found corruption but only fixed some, run it again.
If it says it found corruption and could not fix it, or if after running the SFC for a second time it still says only fixed some then we will try something else.
If SFC has not fixed the issue type DISM /Online /Cleanup-Image /RestoreHealth
If that passes then windows corruption system files should be alright, if that fails you got bigger issues with windows.
If might seem weird but I have seen corrupted windows issues cause network issues before.