If your Raspberry Pi does not support USB power switching, you can connect external USB hub that does (see list of compatible models), and control power on that external hub using uhubctl. You would use command like this to turn power off (all ports): sudo uhubctl -l 2 -a 0 Note that Raspberry Pi 4 is very different from previous models as it has USB3 chip.
Turn off power to Wifi+Ethernet (must use port 1): sudo uhubctl -l 1-1 -p 1 -a 0 A port that continuously turns off and on may not be broken, this maybe a 'Power Management' feature of the device. A port that is not functioning as expected can be mission critical, or an infuriating annoyance at the least. Turn on power to all USB ports (must use port 2): sudo uhubctl -l 1-1 -p 2 -a 1 Computer mice, keyboards, digital cameras, and many other electronic devices now utilize an USB port connection. Turn off power to all USB ports (must use port 2): sudo uhubctl -l 1-1 -p 2 -a 0 List all devices that can be controlled: sudo uhubctl However, USB and Wifi+Ethernet power rails can be controlled independently (except for 4B, which doesn't use USB interface for networking).
But keep in mind that this hardware only supports turning off or on all USB ports at once, not independently. You can use my tool uhubctl, it supports Raspberry Pi models B+, 2B, 3B, 3B+ and 4B - these models have hardware ability to turn USB power off and on.
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