@Florin84 it's an M4, all gigabit. It just doesn't do the autonegotiation very well.

@TP-Link when you provide me with a firmware that displays the negotiated link speed per deco unit I will do so. Now the exercise is pointless. As others have pointed out as well, the autonegotation...

@Daniel-v I have changed the setup of my network, so it's no longer an major issue, the M4 is always at an endpoint and does not connect to another switch via its second port. The deco M4s simply...

@Imee1976 Exactly the same problem. Direct connection to switch, 1000 mbit from one computer to another. Put the Deco M4 in between, 100 mbit only. I think the M4 doesn't play nicely with many...