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Hello, the fault lies with the cable, the end becomes kinked, and once its kinked it will do it again if you straighten it out, the only cure is to replace it, the cable is around £10 and takes around 20-30 minutes to replace if you know how to do it! It is very fiddly and i would suggest taking it to a garage to get it replaced as if you break any of the plastic lugs that it snaps into then you will have a major and expensive repair.
Hope this helps