I just replaced 2 Ubiquiti AC APs in a house with 2 e400's (fw: 188.8.131.52-r1). House is ~2200 sq ft so there is an AP in an open area on the 2nd floor and an AP in the basement with a bunch of connected home devices. Both have 2 SSIDs (primary and guest) and both SSIDs are transmitting on 2.4 and 5.
My problem is with the 2.4 radio. The moment we swapped out the UBNT APs with these, all the 2.4 devices in the house stop working at random intervals. They remain connected to the AP (according to the AP) but they stop passing all traffic. It's like they vanish. We can't connect to them and they can't connect out. Reboot the device, it re-conects to 2.4 and works for a while and then repeats this issue. I can reboot the AP and same thing.
We have tried auto channels (20 Mhz) and manually set the channels. I have tried a number of different power settings. We turned the power way down on the basement AP since it is within feet of the devices that are connecting to it. Many of those basement devices roam to the 2nd floor AP and this is regardless of what channels we are using. We are not using overlapping channels. WiFi scan does show other devices (neighbors) on the same channels but not tremendous noise levels. SNR levels are between 30 and 60 on the 2.6 devices so should be plenty of signal above noise. And this does not seem to be an RF issue, it looks more like the 2.4 WLAN stops talking to the network.
Since most of the connected home devices are 2.4, this has caused most of them to stop working randomly.
5 Ghz devices have no issues (so far).
Fast roaming is off. Band steering has been set to both off and normal - but these are 2.4 only devices. Airtime fairness is on. Multicast is highest basic. Nothing out of the ordinary.
What am I missing? Anyone else see issues on the 2.4 radio like this?