Ok thanks so I just buy CAT 6 FTP and change it?

But the other cables are also UDP and I get 1000Mbps in PC1 for example

It says its CAT5 UTP, so it might be a faulty cable? Is there any way to asure that its the cable? because it is a difficult to change cable, due to the fact that it goes through walls, so before...

So I have the network of my house just like this: Where Switch 1 is a SG105E V3 and Switch 2 is a SG105 and cables are category 5. THe thing is that the Deco TV needs IGMP snooping to work correctly,...