Go to Settings/Photos and scroll down to "Transfer to Mac or PC", Check "Keep Originals".
It is because iPhone keeps Photos in HEIC Format, It automatically converts HEIC to JPG when you copy from USB IPhone Device to Windows. However, this function sucks and causing the iPhone disconnect from Windows. By disabling this feature, you can copy HEIC and MOV format to Windows directly without issues and increase copy speed dramatically.
You can install HEIC extension for Windows 10 here:
https://www.microsoft.com/en-us/p/heif-image-extensions/9pmmsr1cgpwg#activetab=pivot:overviewtab
