Problem with cluster on linux

Hallo to everyone.From sometime i have problems with my asterisk pbx on cent os which is in corosync pacemaker cluster mode with resource groups.The problem is for time the cluster just swap the active one with the other and the only messages is that bond0:link status defenitly down for interface eth0 and than up and down.Can you please tell me where to look for the reason.Thank you.

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