Intermittent Wifi Ping Timeouts

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What steps will reproduce the problem?
1. Being Connected via Wifi on either 2.4ghz or 5ghz

What is the expected output? What do you see instead?
The issue is that intermittently the connection will go from a steady 1-10ms 
ping to dropping packets and having upwards of 30second ping time.  This is 
only on the Wifi (Both 2.4ghz and 5ghz) and only affects Wifi on the N56U (my 
other Wifi network using a different device is unaffected).
Everything running via the LAN is fine and maintains sub 1ms ping time.
Here is a copy of a ping from my MacBook running on 2.4ghz Wifi for the 
duration of 2 of the events:  http://pastebin.com/2aJKD8m2
The timing of the problem seems to happen at any time, whether there's light or 
heavy wifi usage at the time. There's around 4 devices connected via Wifi, but 
the problem will happen regardless of if there's one or many devices connected. 
It lasts between 1 and 5 minutes and seems to "ramp up" over time, going from 
1ms up to say 5sec in the first 10 seconds, then upwards even more as it goes 
on, then it will ramp down again over about 10 seconds back to normal ping time.
When this is happening, running top on the router shows nothing out of the 
ordinary (very little CPU usage), the load average is normal (between 0.00 and 
0.1) and everything connected via LAN runs perfectly.
Having Hardware Routing enabled/disabled affects nothing.
All the settings are normal, WPA2-PSK encryption on the Wifi, guest network is 
disabled, both 2.4/5ghz networks with the same SSID so the computers can pick 
which one they want to use themselves.
All these settings worked fine on the latest stock firmware too.

What version of the product are you using? On what operating system?
Asus RT-N56U running Padavan's Firmware RT-N56U_3.4.3.7-072_dlna
Affects all clients I've tried, including iPhone (iOS7), Android Phone/Tablets 
and multiple MacBook Pros.

Any suggestions as to what I can try to fix the issue?  I'm thinking I might 
have to downgrade back to the original firmware :(

Original issue reported on code.google.com by dukl...@gmail.com on 14 Jan 2014 at 5:50

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Oops, forgot to mention: There's nothing of note in the Log files on either the 
router itself or on the client machines.

Original comment by dukl...@gmail.com on 14 Jan 2014 at 5:51

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Updated to RT-N56U_3.4.3.7-075_dlna, the issue still exists.

Original comment by dukl...@gmail.com on 15 Jan 2014 at 12:17

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I rolled back to the stock firmware (3.0.0.4.374_979) and I'm not having the 
issue.

Original comment by dukl...@gmail.com on 23 Jan 2014 at 11:19

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Yes, mine also have Wifi Timeout..
Seems like revert back to stock firmware solve the problem.. but i would like 
to use padavan firmware as well..
how to solve this problem?

Original comment by darrenli...@gmail.com on 25 Jan 2014 at 4:54

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I'm also having the same issue. Wifi will hang several times a day. Devices are 
still connected, but the connection is unusable, I can't even ping the router. 
It occurs on all connected wifi clients at the same time.

Ethernet LAN is unaffected. Plugging another AP (in bridge mode) into a LAN 
port provides stable wifi, so it's definitely an issue with wifi on this 
firmware.

There is nothing at all in the logs when this occurs. Any suggestions other 
than reverting to the stock firmware?

Original comment by ingen...@gmail.com on 9 Sep 2014 at 7:30