I have a stack of two Cisco SG350X switches. There is an SFP interface, 1000BaseSX that suddenly won't stay up. We've moved SFP slots, changed the SFP, changed the patch cord, rebooted the stack, and the link comes up for about five seconds, and goes right back down. We've also swapped the optics at the far end, and switched to another fiber pair. I currently have a tech about to swap out for media converters, as a sanity test. Any other thoughts?
The onsite tech tells me that the link light for the port was flashing "faster than I've ever seen".
25-May-2021 12:13:31 %LINK-I-Up: te1/0/1 25-May-2021 12:13:32 %STP-W-PORTSTATUS: te1/0/1: STP status Forwarding 25-May-2021 12:13:35 %LINK-W-Down: te1/0/1 
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