IPhone 4S keeps connecting and disconnecting from laptop over and OVER again?

It has been happening for a while but lately it is unbearable. I charge my iPhone on my laptop so all my data backs up and its more practical for me as I use the laptop whilst it charges. Lately it connects and disconnects immediately! It has this "fit" of connecting and disconnecting my phone just goes mad! Works fine when plugged in a wall socket. ITunes is up to date, iOS up to date, it is the only USB plugged it in my laptop and my laptop is a new laptop! I have tried switching my phone on and off but it does nothing, I also checked my USB power from my laptop and it is 500mA per port ( usb 3.0)
Any Suggestions please!

Check the cable. Either it isn't plugged in fully or there's a loose connection in the cable (or the laptop/phone socket)

Solution - Try another cable!

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