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multiple OAM loopback replies

I'm having trouble with one of our subscriber ADSL lines and I'm seeing duplicate OAM replies on their PVC. Anyone know what might cause this? OAM cells drop (and then IP drops too) when line is under load (>3kbps). Here's the debug atm oam interface atm3/0.6208 output:

Jul 23 15:31:29.514 PDT: ATM OAM(ATM3/0.6208): Timer: VCD#1483 VC 6/208 Status:2 CTag:0x153 Tries:0

Jul 23 15:31:29.514 PDT: ATM OAM LOOP(ATM3/0.6208) O: VCD#1483 VC 6/208 CTag:0x154

Jul 23 15:31:29.522 PDT: ATM OAM LOOP(ATM3/0) I: VCD#1483 VC 6/208 LoopInd:0 CTag:0x154 OAM Cell Type 5

Jul 23 15:31:29.534 PDT: ATM OAM LOOP(ATM3/0) I: VCD#1483 VC 6/208 LoopInd:0 CTag:0x154 OAM Cell Type 5

Jul 23 15:31:29.546 PDT: ATM OAM LOOP(ATM3/0) I: VCD#1483 VC 6/208 LoopInd:0 CTag:0x154 OAM Cell Type 5

Jul 23 15:31:29.634 PDT: ATM OAM LOOP(ATM3/0) I: VCD#1483 VC 6/208 LoopInd:0 CTag:0x154 OAM Cell Type 5

TIA

-Chris

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