Ruckus R500 always create new master every morning

[riyan_rohmansya]

I have 8 Ruckus R500 and frequently create new masters every day and takes a long time create it

And the funny thing is that's always happens in the morning.

I have reset everything back to the factory reset also upgrade the firmware and the result is all wifi running normally, but the next 2 days the same problem occurs again.

can someone explain to me how to fix that problem?