My EAP115-Wall keeps disconnecting few minutes after adoption. So I have three VLANs on my network, 

VLAN 1 = 192.168.42.xxx for devices and control.

VLAN 2 = 192.168.2.xx for secure home use. Configured as WLAN with.

VLAN 100 = 192.168.100.xx for visitors, configured as guest WLAN.

It's on VLAN2 with rate limits, different from the secure network. It initially adopted fine and shows "connected" then few minutes later it will disconnected from the the POE switch (ES206GP) that powers it. 

Any suggestion is welcome.