My opnsense router (OPNsense 24.7.11_2-amd64) at least once per day switch all connections from 1gbit to 100mbit. I dont know why it happends but rebooting router always solves this issue for some time. I am newbie so i dont know what else i need provide to solve issue. Just ask me and i do what i can. Thank you for help in advance. I mudt also say that my english is not perfect. My network card is i350-t2 connected with some cheap tp-link 8 port non manageable switch(gigabit).
EDIT: I think its software related. Because when i set to different interface speed than autoselect and then back to autoselect there is no need of restarting router.
You say "all connections", then describe one connection to a TP-Link switch. Are there other connections where the link speed is dropping? If it's just the one, I'd try a different cable, and a different port on the switch. If it's more than one, that would be more of a puzzle.....
Borrow a different switch to test, maybe.
You could always just leave the interface speed manually set to 1Gbps.
But I suppose when set to Auto it is auto negotiating to a slower speed because it has detected some kind of an error in the connection so perhaps it is better to get to the bottom of what is causing it
Probably found a solution. There was one rj45 plug with bad contact. I think it will work now. Sorry for unnecessary posting.