Hello @bouazzaoui,
It's possible that the issue is related to FEC configuration.
Double-check that the FEC configuration on both ends is consistent. Make sure both ports are set to use the same FEC mode.
Do you observe any FEC errors or abnormalities in the statistics, it indicates that there might be an issue with FEC on that particular interface ?
As I concerned, I do enable FEC on the ports and use the cl74 FEC mode. This mode provides a stronger error correction capability and can help stabilize the link.
Best regards
.ı|ı.ı|ı. If This Helps, Please Rate .ı|ı.ı|ı.