@mia this is at my parents I don't want to diy anything because I won't be there to fix it
That's why I paid an arm and a leg to buy the stupidly expensive Fritz stuff while I had a janky to link 10€ router that worked better than this before
I don't think the power line is the issue even though the connection is dogshit because this is an old house and all the wiring is crap (half of the sockets are still not even earthed). But the new Fritz power line is much better than the old crappy KPN branded powerline we had (back when I installed it the first time like 6 months ago I got 40Mbps max on the original power line to my server downstairs but 180Mbps over the Fritz power line, over lan ofc)
But idk my parents live in the middle of the city so there's 81262926 WiFi networks around us ofc which makes this hard (and why I thought screaming louder than the neighbours might help by getting a second mesh AP)
Networks were a mistake