Xperia T USB Connectivity problem after updating to Jellybean

Hi,
This is the first problem I have had with my Xperia T. On the whole I love it.
I updated to Jellybean last week, and until now I have had no problems, and have been enjoying all the improvements.
But now when I try to sync with my PC, it just constantly connects then disconnects 2 seconds later, then re-connects etc. It charges perfectly with the same USB lead, and all my other USB gadgets work perfectly in all of my ports on my laptop. I have re-booted both devices several times, and that has not solved the problem. It's not the end of the world as I can use drop box to transfer files, but it does mean I can't charge from my laptop which I normally do when I'm out and about, and won't be able to do future software updates.
Any one else had this issue? or have a fix? Helpfull suggestions appreciated.
Dan

Try disabling any antivirus/firewall software you have on the PC temporarily and see if this helps.
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