Hello !
I'm having currently a major issue with Cisco SG350XG-24T switches.
Using firmware 2.5.0.83
It all started with some devices that were not showing up on our network after a reboot.
We started to manually change the port administrative status to Down and then Up in order to resurrect the connection.
With further investigation, we noticed this was happening more specifically to devices with 100Mb network interface.
It is like if the switch was not detecting that the link is going down at all.
Instead of rebooting the device, we just went with unplugging et re-plugging the device. Here is a log :

This shows that the port going down isnt detected at all by the switch. Only flushing the port administrative status solves this.
While the port is unplugged, here is what shows cisco UI : The port is still considered as up.

We tested with different devices using 100Mb and it looks like its reproducible.
When we unplug a computer's 10Gb interface, the switch behaves as it should :

An the port is shown down correctly in the Port list...
EEE is desactivated.
Do you have any clue ?