iPhone keeps connecting and disconnecting from Mac

Fix iPhone keeps connecting and disconnecting from Mac (2020)
https://shudhtech.blogspot.com/2020/04/iphone-keeps-connecting-disconnecting-mac-2020.html

Fix 2: Reset the USB ports with terminal command

The iPhone disconnecting after few seconds from mac can be an issue with Mac USB ports. One good way to fix the issue is to restart the MacBook Pro USB ports. Rerminal command to restart the USB port and it always gives a solid connection after.
Below is the command to execute on terminal:
1.    On your mac go to Applications > Utilities >terminal.
2.   Type this commands >  sudo killall -STOP -c usbd
3.   Hit Enter