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So the hub is recognized by the host, but the hub is always refreshing? Or are the downstream devices connected to the hub refreshing?
Please check that SMBUSz is not pulled low, and that USB_VBUS is steady around 500 mV. Is the clock running continously?
Which power rail is pulling the extra 200 mA when devices are plugged in?
Can you confirm that there is a thermal pad with adequate solder under the hub, inconsistent behavior is often linked to thermal pad issues.