I forked your comment so we can track this separately. It's probably related to the same issue as the standalone - resource starvation. We've been able to reproduce in-house. Configure a ZF2942 with 1 WLAN - no problem. Configure with 8 - it chokes. We're still investigating whether we can implement a software fix for this.
RE: sw fix, 2942 is old, don't support 802.11n, and frankly, I don't think it's worth troubleshooting. Be as it may, I would be glad to apply any fixes team Ruckus comes up with.
As far as power cycling APs after a factory reset, am unable to perform that as both Wi-Fi systems are in production now, and am reticent to upgrade again for the sake of power cycling and factory reset; I'd rather stay here for now.