Modbus plus token ring

Hi, i am investigating a 20 year old communication network that run on Modbus pLUS
At particular node(HMI) the token is dropped continuously. changed the HMI, Checked the grounding but still the occasional failure token passing to next nodehappens .i am using mbpstat to see the token map,
my second q’s is what happens if the node that has a token turned off, will it pass after turened on or regenerate the token again.

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