HP 420's drop off for exactly 60 secs

[Johnb_2]

I have a bunch of HP 420's still floating around our network. Occasionally 1 or 2 will drop off line and I will receive an email from my zenoss that it is down. I am running the latest firmware for these AP's. I attempted to turned on multicast/broadcast limiting on the AP and it completely dropped off line until it was powered off. The switches in our environment are not dropping only the HP 420's. Very confused by this behavior.

[Johnb_2]

I also checked spanning tree on the port and the switch log where the AP plugs in and nothing. Nothing in the AP's log either. 

[sprindle]

I have RP 230's that get an ip then drop 3 packets and repeat for several hours before turning off.

Have you seen this before?  Are you 420's on 2610's POE?

-sp

[DocD]

I have seen this after turning on and off the look for adjacent APs. Do you have that turned on?