E1 IMA seriously problem

first : i'm sorry for my bad english i have a 7204 BRAS and 16 E1 ima line that connect to it, but one of my E1 alternatively goes up and down, i have same config in all of my E1

if any body have any idea and need to my config i can send it

plz help and tnx.

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r.shams.z
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