@DrToast IMHO this is a wireless adapter driver problem, since other devices are fine with 5 GHz network. Sometimes many attempts for driver installation may cause such kind of issues. Go through...

@DrToast It sounds to me like a driver issue. I looked at the Intel support portal and the final driver for Windows 10 is: You can try to update the wireless adapter driver by selecting the adapter...

@LieLianX It could be because of several reasons. Read and follow this or this troubleshooting guide if it resembles your case.

@LieLianX Here's the difference between router and AP mode features. When you use connection LAN port to WAN port you're introducing double NAT in your network - hence the problems you've described....

@DrToast What's your PC wireless card make and model ? Did you update it to the latest drivers for Windows 10 ? Are you receiving any error messages when trying to connect to the wireless network ?...

@LieLianX Here you can download the EU version from. You already have the latest available on your device.