I did to update firmware and the problem was gone . Thank you so much.

Thank you for your advise, I set the schedule to update firmware by this evening.I will tell the result once success update firmware.

I checked 2 AP from 9 AP.. FIRMWAREUp to dateCurrent version: MR 25.9

I try to checked by myself on the knowledge base. but can't fixed even I set SSID availability is disable/ or set to enable . This is the 3rd time which I faced this issue.since I purchased feb2018 1st and 2nd time of problem I fix it by reset to fac...

yes, I did not change anything and also face the issue for all client . laptop, IOS, Android