Thx for the quick reply.
We already have 5.6.2 build1486 on the FortiWiFi60E, so far stable and nothing to complain. We are also able to manage the FortiAP 223E within this release, I was just wondering why I was not able to find any FortiAP Firmware where 223E is mentioned as supported model and I would not have searched in the W2 section.
The configuration is quite simple, Fortigate 200D has an IPSec VPN tunnel to the FortiWiFi 60E which is wired connected to the FortiAP 223E. We have created a new 223E profile on the FortiAP, changed the country setting and the channel to 13. The SSID profile we had already on the FortiWiFi and was working for months. The SSID configuration was transferred automatically to the FortiAP, WIDS is disabled and so far nothing else we changed. On the FortiWiFi we use a Software Switch with the LAN and WIFI Interface and the Traffic mode on the AP SSID is Tunnel.
This constellation was working fine for 2 days, then we got reports of the users that they can't reach some SMB shares anymore, everything is getting very slow or some websites are not loading anymore.
We have seen a few "last failure : 14 -- ECHO REQ is missing" with "diag wireless-controller wlac -c wtp" so probably it could be the same problem as mentioned from ggnt in this post?