USB Host ECHI port is disabled and transaction error occur suddenly AM3517 on WCE7

We use USB Host ECHI (hsusb2) with ULPI.

We are suffering from a issue that USB can not communicate suddenly.
As a result of the investigation, we noticed that a transaction error occurred when port is disabled.

We found out by USB protocol analyzer that abnormal data exist.

For example, the frame value is  uncorrect though the CRC value is correct.
If noise is the cause, the CRC value should also be uncorrect.

This means that USB Host (not USB Host Driver) changed the frame value to be uncorrect value.

Please tell us the solution this issue.

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