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Perform a tcpdump on bridge and tap interface of your VM, just to see if you can follow the packet. Try to trace DHCP request/reply or ARP whoas and reply, as it goes troughout the interfaces.

Since you have VMs for compute, you might have the ports in promiscuos mode, and this can generate dupplicated packets, confusing wich port to use at the bridge.

You can test this using brctl showmacs command, at some point you will see the tap MAC associated to the wrong port number, or flapping from port to port in time.