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PIM DR &NBRChanges on 4900M

I am seeing the logs belw on 4900M switches recently installed with multicast PIM spase-mode enable. Nothing fancy enable on the interfaces between the switches, just PIM spase-mode and switches have PIM neighbor enable.  We are seeing the logs on the 4900M and also switches with PIM direct neighbor peering  with the 4900M . These messages just tell that the PIM adjacency failed and then was created again but i do not understand at the moment why i am seeing the logs constantly. Config has been checked and all is fine.

The 4900M ( with WS-X4908-10GE ) is connected to 6500-E (WS-X6708)

code on 4900M is  cat4500e-entservicesk9-mz.122-53.SG1.bin

%PIM-5-NBRCHG: neighbor DOWN on interface TenGigabitEthernet2/1 non DR

%PIM-5-NBRCHG: neighbor DOWN on interface Vlan2502 non DR

%PIM-5-NBRCHG: neighbor DOWN on interface Vlan602 DR

%PIM-5-DRCHG: DR change from neighbor to interface Vlan602

%PIM-5-NBRCHG: neighbor UP on interface TenGigabitEthernet2/1

%PIM-5-NBRCHG: neighbor UP on interface Vlan2502

%PIM-5-NBRCHG: neighbor UP on interface Vlan602


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