Access Node effecting Other Building Nodes

We have one access ring having 6 Access Nodes(3750) and 6 Building nodes(2950) connected to each Access Node.Find ring connectivity diagram in attachment.
Whenever Access Node 4 is become unreachable (i.e Due to power problem) Access Node 3 & 5's Building Switches got fluctuated twice for 10 to 15 seconds (Once when access Node 4 is down and second time when access node 4 is up). We've checked logging also on both Building Switches but not found any info. for this problem.
Also, We've checked all the configuration on all switches (AS/BS) and found all configuration is ok on all switches.
Pls help....

This probaly has something to do with Spanning-Tree convergence.
What do you mean by "Fluctuated"? Do you see complete downtime on the building nodes?
Do you have any trunking going on between your building and access nodes? What settings are your building-access uplinks on?
May we see a sample of your configs for a building as well as access node?
Cheers,
Josef.
PS - I think the convention for naming "Building" (or Distribution) and "Access" functions may be the reverse of what you have in your diagram.

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