I'm using CAPsMAN from my PoE switch (CRS328-24P-4S+) and all my APs will disconnect all devices simultaneously sometimes. The timing varies, but I've had from 2 days between occurrences to 1 hour between occurrences.
APs are CAP AC.
I have 4 SSIDs setup, 2 using a password, 1 open and hidden, and 1 using MSCHAPv2.
I normally have between 10 and 20 devices connected at any given time.
Disconnecting all but one AP to see if there's interference
Changing provisioning action from create dynamic enabled to create enabled
Monitoring CPU and Memory usage, to see if there's a spike at the time of disconnections (there isn't)
Using different cables to connect the APs