Hello,

I have problem with APs, that randomly disconnected from the controller. The network is in a school with the following equipment: Router ER605 v2.0, switch SG2428P v5.20 and 18 APs model EAP615-Wall(EU) v1.0 distributed over 3 floors. All APs are connected by cable - no Mesh is used. For the WiFi network, we use PPSK without RADIUS, and it is segmented into 3 Vlans for administration, teachers and students. The problem is expressed in the disconnection of random APs at random time, for no apparent reason. At the same time, the switch ports are Up and show 1G connectivity, there is no ping to the disconnected APs and no connected clients. It seems like the access point is stuck and not communicating with the controller. We support 4 more networks in other schools, which are built with the same hardware and have a similar configuration but have les APs (up to 15) and fewer clients, but we have not had any problems there for years. The same problem is observed in another school we support, where the number of APs is 47.

It's very strange problem and i can't resolve it.