Epmp 3000 SMs wont reconnect after rebooting the access point

I have 10 SMs on a epmp 3000 AP, rebooted the AP and now only 6 of the 10 reconnected… what gives… all I did was reboot the the AP?

Possible they jumped over to another AP ?

@brubble1, Is that possible when the SM is set to only one preferred AP? Also, I got the 4 customers to power cycle the SM and they reconnected. Not sure what is the underlying issue… I dont think ive ever had that happen before.