RB260GSP port speed problem

Hello everybody
I have 3 RB260GSP v1.17 connected to each other one switch connected to up link and one link to each switch , everything’s working fine for almost one year but last few weeks I have problem with switch that connects 2 switches to up link, the problem is ports connected to other switches stuck at 100Mbps speed until I reboot the switch and traffic is very low when it’s stuck at this speed it’s maximum average 50 Mbps

Thanks in advance
Best regards


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