Hi @chheamenghout1, I regret to hear that you have run into problems with your Anker Powerport 4. In order to offer better service, could we trouble you to try another working outlet and cable to see if the same issue happen? could we trouble you to unplug one of these devices to see if the same issue persists? Could you please contact us Anker at "email@example.com" with above test result? Please be assured that we offer 18 months warranty(replace or refund) and lifetime technical support. If the problem is within our warranty coverage, we are glad to arrange a replacement to you for a try.