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w5500 arduino comunication problem

Hi I have two w5500 chinese ethernet module. one of them somtimes work and somtimes doesnt work. arduino says ethernet shield was not found. I think it is a spi problem but somtimes works good
i thing ethernet module could have spi frequency problem or oscillator problem
or cs pin and rst pin pull up.

am i right ?

how can i test According to Probable problems?
I use ethernet.h library

If you bought a module that we didn’t sell, I can’t say that it can work.
Because the schematic is unknown.

I think you should check the SPI waveform with an oscilloscope.
Please capture the waveform that reads the Mac address and upload it, and I’ll check it with you.

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