Hello.
Your symptoms seem strange.
Resetting the W5500 will reset the internal TCP core and PHY. Return to normal.
With this in mind, it seems to be a problem with the MDI signal on your board.
To use the W5500 normally, TCT and RCT of RJ45 should be connected to each other.
Your circuit is connected to 3.3V RCT. This can be a problem because excessive voltage is input to RX. This is a simple doubt.
We are not tested. We will test this.
Thank you.
