I have moved to an apartment where the network port is too far from my desktop so it's not possible to have wired connection. So, I setup a network using an extender. I initially setup A. I had an old router (Tilgin) lying around so I used it. But the network speed on Desktop/NAS was kinda slow.
Then I replaced the Tilgin router with a switch as shown in B. Now internet on the Desktop/NAS is weird. It's on and off a lot. It works a bit when I am browsing and then it goes off completely. When it works, the speed is the same as it used to be. But the connection is so intermittent and choppy. Every few secs, it's like there is no internet at all.
Internet on the smartphone/laptop from the first router (tp-link) and extender works fine in both cases A and B, so I assume it's something to do with the switch.
Any ideas on what might be wrong? Perhaps something conflicting? I am not even sure how to diagnose this and what metrics to look for. The desktop is running Windows.
EDIT: Long story short, the wifi extender can only handle one wired device.