Access Point dropping subs on the PMP450

Why does the AP drop the subs from time to time?  To fix we need to reboot the AP.

We're going to need some more information to help you out. What band are you using? What firmware revision are you using on the AP and SM's? Does this happen to the same SM's every time? Does a reboot of the SM allow it to reconnect or do you always have to reboot the AP?

I can't say that I've every experienced a problem with SM's dropping and taking a reboot of the AP to have them reconnect.