After some time, clients (Laptops, tablets or smartphones) fail to register with the AP. We cannot tell if it happens within a certain period of time.
First everything seems to be fine. The client finds the SSID, but when trying to connect, the client does not get an IP address.
Restarting the AP (power cycle) solves the issue and the client can connect immediately without any problems.
The issue was observed with firmware 9.8.
In the meantime we upgraded the firmware in steps to the 9.9 and then to the latest release and 184.108.40.206.336, but we are not sure if this will solve the issue.
APs are controlled by ZD3000.
Log files of two APs are available for review. We expect that ~10..15% of APs are affected by the issue.
Please let us know if you need further information!