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When connect at instance from many path is disconnect and compute host disconnect too

Hi, I installed openstack mitaka version with one controller node and 2 compute node by rdo project. I configured all projects and (External-private) networks fine . I created new instance at project connected at private network and has all valid features . It's pingable and connected fine . Now the problem when connect at that instance from many paths the network connection disconnect and the compute host disconnect too and when I ping at it show destination host unreachable . when wait at least 15 min it come back again . when did ssh connection at instance and run top command the instance frozen . Kindly, Help me about my issue .