Wireless clients sporadically getting Limited Connectivity, APs dropping packets

[John_Rowler]

We have a pair of V2110 wireless controllers and around 400 3825i access points. Controller firmware is 09.21.06.0002. AP firmware is 9.21.27.1387X.

About 4 months ago we noticed a problem where the APs would just drop traffic. A packet capture will show a ping coming into the radio from the client, going out the Eth interface on the AP, the reply coming back into the Eth interface, and never going out of the radio.

A particularly strange detail is that this only happens with certain source/destination traffic. For instance a client cant ping the gateway of 10.1.20.1/24. but cannot pint the server at 10.1.20.2. Since we can see the ping making it to the server and the ping reply making it back to the AP, we know it's not a firewall/ACL/routing issue on any other part of the network. The traffic disappears at the AP. Clients cannot communicate with anything on the Internet or any of our servers (DNS, DHCP, etc.) during this time. They can ping gateways in any subnet but that's it; everything else is failed.

More details:

-We've gone through several firmware updates with GTAC. Nothing has helped.
-The issue can affect any client on any AP in any location at any time.
-The issue is intermittent; it may happen every few minutes or once per month to a particular client in a particular area. Once failed it may last for seconds or days.
-While it's affecting one client, other clients on the AP may be working fine or may also fail.
-It can happen on either 2.4 or 5.7GHz.
-It can affect any type of client (phone, laptop, tablet) and any OS.
-Restarting the client or AP will sometimes fix the issue, sometimes not.
-It happens with our without using NAC, or any other type of authentication. It happens on completely open networks as well.
-It happens on both bridged at AP and bridged at controller topologies.
-It's not limited to a particular subnet or VLAN.
-It happens with or without Flexible Client Access enabled.
-It happens on either controller.
-GTAC hasn't made much progress on the issue in 4 months.

[James_A]

I'm going to 9.21.07.0007 now as well, 09.21.03 had various dropouts.

[Doug]

Let us know how it works out for you Evan.

[JP4]

Wondering if the controller type plays a role in this at all ? I have not upgraded yet (still on 9.15.x), but have 5210's. I have gotten some reports of the issue, but am wondering if it was not as bad in 9.15 or maybe the controller type plays a role in some way.

[Ronald_Dvorak]

Here the scheduled AP reboot feature article....

https://gtacknowledge.extremenetworks.com/articles/Q_A/On-the-IdentiFi-Appliance-can-I-schedule-all-...

[FES]

We have the same problem. 480 ap's and two controllers V2110 with 3805i and 3825i... the situation is frustrating.
we are in 09.21.5 in controller but in some buildings we have installed a 9.21.07.0002, but the problems persists.
does th 09.21.07.0005 solve de problem?
are there any way to reboot all the aps automatically overnight?
regards
I hope that the update is published as soon as possible...