NO DETECT SXT 5ND

Hi guys
I have a SXT5ND that sometimes finds and connects to Winbox, and sometimes it doesn’t.
There is always a confirmation that the device is booting.
I programmed with NetInstall.
I replaced the network IC(swap net).
No piece of physical damage.
What should I do?
Thanks.

Replace this old one

What should I replace؟
i replaced lan ic. but Problem not resolved

AR9344?

no.i replaced Transformer Module(swap net ns601680).
What could be the problem؟