So I usually don't post on these forums but I've had this weird issue for about 2-3 years now. Whenever I plug in any usb accessories (lightning cables, usb ethernet etc.) they will not work when connected directly to my macbook, only when using a usb hub. When using the hub everything works fine. However, any usb flash drives directly connected to my macbook work fine. For example i have a sandisk that's continuously connected 24/7 even when I put my computer to sleep and wake it up it still shows as connected. So usb drives work great, usb accessories not great unless plugged into hub. HELP!