[j-nsp] Juniper ECMP Junos 7.5R2.8 not working

[Rupesh]

I have a scenarion wherein i send traffic across two equal cost links connected to Juniper M320 with Junos 7.5R2.8. The traffic load balances with multiple flows across both the equal cost link ..but whenever i break one of the links all the traffic shifts to the other link, when the link is restored the 50% traffic previously shifted to the sec. link does not come back up on the restored link. 

Does this mean that ECMP on junos 7.5R2.8 is broken ...????

Cheers 
RN