W5500 broken link

[S. Petrukhin]

Hi, friends!

Has anyone encountered the problem of the WIZnet W5500 chip hanging from interference in a power line?
Line is completely isolated from the circuit galvanically ин optocoupler.
Even if the power supply is simply applied to the power wire, the connection is broken from time to time.
At the same time, SPI communication W5500 with the MCU is working, the Link indication is displayed both in the W5500 register and by LEDs.
But even ping, which is autonomous inside the W5500, does not work.

PE connected. I checked different Ethernet switches.

Complete circuit section diagram:

[S. Petrukhin]

Added information.

W5500 resets the status, loses the PHY and IP settings.
There may be an incorrect reset scheme, I'm checking it...