Plugable USB 2 7 Port - Phone problem.

I’m having issues with my Plugable USB 2 7 Port device, model USB2 HUB AG7 UK.
After working for some time, its stops recognising the iPhone 6 & lead regularly. I’ve tried a couple of leads that charge elsewhere in the house. This hub works well for the other printers & devices I have connected except for the phone. It makes the Phone buzz from time to time. Any thoughts please?