Connection switch to another AP code 18 29 1

[bobf41]

We have a U shaped building floor where in each side we have 1 R320 unleashed.

So 1 left, 1 bottom and 1 right in the U.

We notice that at some points the WiFI gets instable, this morning I did a trace on a client and notice that the device working in the upper right of the U gets disconnected from AP1 which had an excellent connection on 5Ghz and the clients start connecting to AP2 in the bottom of the U which get a poor connection.

In the trace log I get from AP1
Reason: (code 18)Timeout expired
Reason: (code 29)Dropped auth frame which filtered by TCM
Reason: (code 1)Unspecified

After rebooting AP1 everythings works again.

We are on version Version 200.10.10.5.253
Around 12 devices connected. (5 laptops, some phones a tablet and a chromecast)

We already have splitted band SIDs.
Fixed channels and limitted power to reduce overlap on the 5Ghz band.
AP1 Channel 52 -3dB, for 2.4Ghz channel 2
AP2 Channel 56 -5dB, for 2.4Ghz channel 6
AP3 Channel 60 -3dB, for 2.4Ghz channel 11

SmartRoam is enabled through CLI

wlan32: Roam Factor (scale=1-10): 4

Any help will be appreciated