Skipping gears when paddle shifting

[CatalystV12V]

While out on the Snowdonia run on Sunday I noticed an odd behaviour from my 2014 V12VS when upshifting in Manual mode.

A single pull on the + paddle would, on occasion not instigate a shift and on other occasions elicits two shifts - pull once , go up 2 gears.

I've spoken to one of our friendly Independents who suggested driving in in 'Drive' to see if same behaviour was seen - it was not. Aside from the clunky changes all gears were selected sequentially. [60 minute drive].

The current thinking is the paddle contacts are contaminated. I've done some sleuthing and found this thread :
https://www.6speedonline.com/forums/aston-martin/4...

However it draws no conclusions as to remedy.

Has anyone seen this before, or more importantly how was it fixed.

Thanks as ever for any feedback..

PS downshifts are fine