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384.3 (and maybe 382.1_2) RT-AC88U no internet over wifi

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sebular

New Around Here
Apologies if this isn't the right place for troubleshooting this, but I came via github and thought this was worth sharing.

The symptom is that my wireless devices started dropping their internet connections in a rather dramatic fashion. Wired devices had no trouble with internet access. Certain wireless devices had no trouble with local network connectivity. In fact, I recently used scp to copy a 3gb file without any issues.

Writing this, it also just occurred to me that I haven't reproduced the issue on a non-Apple product. Two different MacBook Pro models (2013) and an iPhone 6 both had identical trouble at the same time, but a Nintendo Switch seemed to work fine.

The issue also seemed to occur intermittently. A few days passed without any noticeable issue, and suddenly it returned in full force. Stupidly, I didn't confirm that the Nintendo Switch was working while the Apple products were having trouble.

I also have to admit that there's a plot hole in my story, because I recently formatted a partition and as a fair-weather router person, I'm confused by the release versioning. I know that I installed whatever the latest stable release would have been on January 22, 2018, but I don't actually have the file. Looking at the download page, it looks like the legacy 380.xx_y has been getting updates along with 38x.y_z, so my best guess is that 382.1_2 is the firmware that was giving me intermittent trouble, based on the assumption that I would've gotten the latest major stable release.

However, I just upgraded to 384.3_0 stable in an attempt to fix it, and the symptom continued. This persisted through a factory reset, though I didn't do a hardware power cycle.

I noticed this thread and it's unfortunate that OP lost his cool because the Wifi symptoms he describes sound pretty similar to what I was experiencing. I don't have a deep knowledge of these routers, but I think the AC88U is the same as the AC3100, and I don't know if those behave similarly to the AC3200. Regardless, it seemed related.

Anyway I figured I'd just downgrade to 380.69_2 and sure enough the problem went away immediately. So I don't actually have a problem since I'm perfectly happy running that firmware, but I figured I'd leave this here.

Thank you to everyone who works on these releases and helps out in the forum. You've done a very good thing and I appreciate it!
 
Try the usual recommendations first:

1) Power cycle, to reset the electronics inside your router
2) Disable Airtime Fairness, MU-MIMO and Implicit Beamforming
3) Set to fixed channels 1 and 36
4) Forget wifi configuration on your clients then reconnect them

I use an RT-AC88U as my primary router here, and wifi is perfectly stable for me (I had 8 days of uptime when I flashed a new test build yesterday afternoon).

BTW, the thread you are referring to is about the RT-AC3200, not the RT-AC3100 - different architecture.
 

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