I purchased a BiBAP 8800AXL R2 from Amazon and it has been nothing short of a nightmare so far. It took me countless of hours to figure out to why my 5Ghz Wifi was freezing on every device, but I finally did...
Basically, if you enable QoS on the router, the 5Ghz Wifi will freeze on every single device. Like, web pages will take either forever to load, or they will not load at all. This only happens on the 5Ghz wifi, 2.4Ghz is unaffected by it, and this only happens with QoS enabled.
Picture of my QoS:

If you remove QoS, suddenly the 5Ghz wifi works no problem at all! But with it enabled, no more 5Ghz, all my phones, my consoles, my laptops, Wifi just stops working...Please help.
Wireless Driver Version 7.35.260.80018
Software Version 2.52.d15