The following worked for me. This is from https://macreports.com/iphone-keeps-connecting-and-disconnecting-from-mac-fix/

On the Mac, open the terminal,

 sudo killall -STOP -c usbd

Or use Activity Monitor to kill the process.

This will restart the USB daemon on Mac. After this, my phone asked for 'Trust' only once.

The following worked for me. This is from https://macreports.com/iphone-keeps-connecting-and-disconnecting-from-mac-fix/

On the Mac, open the terminal,

sudo killall -STOP -c usbd

Or use Activity Monitor to kill the process.

This will restart the USB daemon on Mac. After this, my phone asked for 'Trust' only once.

The following worked for me. This is from https://macreports.com/iphone-keeps-connecting-and-disconnecting-from-mac-fix/

On the Mac, open the terminal,

 sudo killall -STOP -c usbd

This will restart the USB daemon on Mac. After this, my phone asked for 'Trust' only once.

The following worked for me. This is from https://macreports.com/iphone-keeps-connecting-and-disconnecting-from-mac-fix/

On the Mac, open the terminal,

 sudo killall -STOP -c usbd

Or use Activity Monitor to kill the process.

This will restart the USB daemon on Mac. After this, my phone asked for 'Trust' only once.