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@edmundro
If none of the above helps and the screw on the shifter is as tight as can be then try cutting a washer from a bit of thin tupperware-esque plastic to slip inbetween the the shifter and washers that are already present.
I had the exact same problem and it solved it a treat as it allowed me to tighten the shifter a tiny bit more so it had no chance of slipping. Didn't affect the feel of the lever either.
Edit - EEI got there first.