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I returned this low performance hub. But the USB spec says that voltage should be 5.00±0.25 V. So, voltage may not be the issue. If the device works correctly when directly connected to the computer, then just return the USB HUB, and upload a video (on youtube or somewhere else) so people can see the problem and not buy this low performance USB HUB.
If you need a high performance USB HUB just get this: