Map not update

Map not update

Hi Support Team
    My Customer have problem about OpManager V. 8 (Build 8723) .  I install in Widows Server 2003 R2 Standard Edition Service Pack 2  .  My Problem is sometime the symbol in map not update status.  I try to poll but it still the same. If i unmanage and manage it the symbol will update .
   Please help me to solve the problem.
 
Thanks
Ittiphol.C

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