Currently we are running AP Firmware 188.8.131.52.373 in our Default Zone, where 4 Zones are included and it works quite fine.
When upgrading to a newer Firmware, last tried with 184.108.40.206.698 - three zones are working as usual, but in one zone clients wont reconnect to the wifi networks anymore, except a few. Mainly we use R500 APs. When downgrading to the old AP Firmware, everything is fine again.
Maybe anyone has an idea, or a hint why this is happening?