![]() In other words, to get the best performance, make sure that the USB port on your Mac and the USB cable to your device meet or exceed the USB specification of the device itself. For example, if you connect a USB 3 device to USB 2 port, your device is limited to USB 2 speeds, and it can't draw more power from the port than can be delivered over USB 2. ![]() ![]() USB specifications all work with each other, but speed and power are limited by the cable or device that uses the earliest specification. " Get the best performance from your USB devices I'd also recommend reviewing this information as well: I'd recommend using the steps in this resource to reset the NVRAM on your Mac this will also reset USB ports to their defaults and could help the behavior you're seeing: Reset NVRAM or PRAM on your Mac I can see why you'd reach out about this behavior I'd like to help. I understand that after a few hours of use the USB-C port on your Mac stops responding and you need to disconnect and reconnect the dongle you're using in order for it to respond. Thanks for reaching out in Apple Support Communities.
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