I was having the same issue with my AC5300 and an AC88U and was just about to go back to the older firmware but decided to check the revision history.
Asus released firmware 20942 which includes "improved AiMesh Performance" along with a bunch of CVE's and other vulns. Installed this as I'd...
Just bumping this as I still see a lot of people posting with this issue. Airtime Fairness has fixed this. It's been working perfectly for nearly 2 months now.
Update
I had another rummage around the ASUS forums and found some posts related to a work around that asus appear to have provided.
Under Wireless-Professional there is a setting called "Airtime fairness". Disable this and I can now appear to get DHCP address leases via 2.4ghz wifi. I'll...
Hi Guys,
Just bought an RT-AC5300 and very happy with the performance thus far but I've hit a bit of a problem. I did have a search and I discovered there were some issues at a particular firmware level that stopped clients on 2.4Ghz having their DHCP requests forwarded. If I configure a static...