I feel your pain on the Wireless Controller portion.
It seems the last couple of Intel controllers released aren't the best. Normally Intel is among the best if not the best, but their last previous releases have not been favorites. I have the Intel 8260 in the G752 and it looks to suffer the same problems.. Just to give some background, I work for a small rural ISP in the IT department and build my own desktop machines. I buy ROG laptops to game at friends houses/lans instead of hauling around my desktop. I also use my laptop for oncall work when I work from home.
One of the first things I did when I got my laptop was work from home. I noticed it was extremely slow when I remoted into my desktop at work. It was so laggy I had to get on my desktop, which worked fine. We have 3 desktops, 4 tablets, 4 cell phones, chromecast, Smart TV's, and some consoles connected at my house. I have the Asus AC3200 which I use at home on our cable connection which is 120mbit/12mbit. I have zero problems with any other device in my house, including my previous G751, so I know the problem is isolated to this machine.
I've been doing some research to see what I can find, and it seems this is not an isolated issue. It also seems the controller works better on a 5Ghz band over a 2.4Ghz band. The AC-3200 is a Tri-band router, so I have two 5Ghz bands and One 2.4Ghz. I tried both 5Ghz bands and they seem to work better, but I still get intermittent lag when I know I should not. Distance does not seem to make any difference. My desktop which has an Asus PCE-AC68 Wireless Adapter in it works fine right next to my laptop without the lag. Im starting to think the Intel AC adapters are not all that great. I think there may be an incompatibility issue between these adapters and some router chipsets maybe. Because the problem doesn't seem to be isolated to only ROG laptops. There are other complaints from various manufacturers with these cards like HP, Alienware, Sony VAIO, ect.
I may end up looking for a replacement and swap the wireless adapter out. Although it looks like the wireless card may not be that accessible in the G752 as it cannot be seen under the memory/hdd plate on the bottom of the laptop. Hopefully its not too hard to get to.
EDIT: Also, drivers have been updated directly from Intel, Bios is also 206 which is the newest. AC-3200 is also on newest firmware.
(ROG has simply become too expensive compared to the competition with same specs... 😞 )
MSI GE75 Raider 10SGS - i7 10750H - RTX 2080 Super - 32GB Ram - 1TB WD NVMe - 2TB 960 EVO - 300Hz 17inch Display
RETIRED: ALIENWARE R17 R5 - i7 8750H - GTX 1070 @ 1.9Ghz - 16GB DDR4 - NVMe 970 EVO 1TB - SSD 960 EVO 1TB
SOLD: ASUS G703VI-XH74K, RETIRED: ASUS G752VY-DH72, RETIRED: ASUS G750JH DB71 , RETIRED:ASUS G74Sx DH72