ITunes could not back up the iPhone because the iPhone disconnected (iTunes 11.4.0.18) Windows 7 Home Premium 64 bit OS

Dated: Fri Oct 10 2014 (Malaysia)
i'm using Windows 7 Home Premium 64 bit OS with the latest version of iTunes (11.4.0.18).
My iPhone 5S already installed with iOS 8.0 but now iTunes unable to do the latest "Back Up" before i can perform the upgrading of new iOS 8.0.2 which iTunes keep on prompt an error message @ iTuens could not back up the iPhone because the iPhone disconnected.
The last "Back Up" to my computer is on Oct 2, 2014 2:24 am. Due to the failure of the "Back Up" so iTunes unable to perform the upgrading of new iOS 8.0.2 to my iPhone 5S. Therefore, do hope that my problem can be solve ASAP.
TQ & Regards,
Mr. TanCW

Hi tcw iphone malaysia,
Thanks for visiting Apple Support Communities.
If you are trying to back up your iPhone, but iTunes for Windows is not detecting the device reliably, I recommend starting with the steps in this article:
iOS: If you can't back up or restore from a backup in iTunes
These steps can help resolve many error messages that appear when connecting your iPhone to a PC.
Best Regards,
Jeremy

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