I've got this manageable switch : https://www.amazon.com/TP-Link-Ethernet-Sheilded-Replacement-TL-SG108E/dp/B00K4DS5KU/ in my network for about 3 months now.
Yesterday I noticed that a computer directly connected to it did not have gigabit link (100mbps instead). Since I had just reinstalled it I though it was related but after swapping the cables between different ports and devices, I came to the conclusion that the issue was the switch itself.
I've also checked that all the ports are on 'auto' setting.
What do you think of it? Should I buy a new one and return this one?