Fortigate Issue with VMWARE - DRS

I have a fortigate standalone with a DRS resource enable in a vmware environment. A issue have found. I do not ping some vlans behind the firewall and the message is "DUP!" in ping test.  I have a log in a vmware shows the host with my fortigate was hosted are commuted to another host in vmware (drs resource) Can you help me ? Is recommended that i fixed my firewall in only one host in vmware to solve the problem ?

Paulo Aun