UBIQUITI NANO M5's not connecting

Ubiquiti Nano-Stations M5 ( p-2-mp )

I have 4 Nano-M5s / 1 In AP mode and 3 in station mode ...

Until Monday the stations we are fine and connecting to the AP - 1 stopped.

Config looked fine / flashed to the latest firmware and even reset to factory.  Assumed that it was that M5 Station.  Took it back to our lab / configured another AP, and walla - it connected to problem.

So appears that something on the M5 AP is the problem.  

Is there a connection log that I can check on the station side ?

Any thoughts?
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