hi, one rogue ONT may not effect all the ONUs, but still we need to find out the issue one and doing the action for it , below is the guide for troubleshooting this issue and how to resolve it ,
https://support.huawei.com/hedex/hdx.do?docid=EDOC1100018501&id=coper_6034&text=Detecting%252520a%252520Rogue%252520ONT&lang=en