Hard to say off just that configuration. I see you are on old spanning tree (802.1d). You may want to move to 802.1w for faster convergence as 802.1d is pretty slow.The command is "span 8" at the vlan level. "show log" should also give you some clues as to if the switch is trying to give out addresses. If we can't get a clue out of these outputs, it may just be easier to open a case and have an engineer look at it with you.
Ben Beck, RCNA, RCNI, Principal Technical Support Engineer
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