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AM26C32M: Error of HLDC (High-Level Data Link Control) from AM26C32MDREP

Part Number: AM26C32M
Other Parts Discussed in Thread: AM26C32

P/N: AM26C32MDREP
Description: RS-422 Receiver
MFR:  TI

Our customer put AM26C32MDREP in place of DS26C32AME/883, which was discontinued few years ago, and experienced a problem that the device started to generate error of HLDC (High-Level Data Link Control).
Please advise what are the differences between these two parts.  AM26C32MDEP seems to have the range of minimum differential input voltage of  /-100mV on the datasheet but I am not sure what else might cause this issue.