Sometimes there is an Invalid output configuration or Invalid input configuration

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When I use an EK1100 and an EL6751, it works fine，When I use an EK1100 and multiple EL6751s, sometimes I can't get into the op state, but after I start it multiple times, it works fine. My code is changed from simple_test

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here is my code screenshot

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the error

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After re-init several times, it entered a normal working state，here is the wireshark file.Thanks~!!!!!! can.zip