I'm not sure if it will apply to a Leon but the later R32's with DSG sometimes suffered with faulty mechatronics units which made the gearbox do random things - it wasn't a cheap fix either. I think it applied to the Golfs made between late 2007 and early 2008.
I don't know if the gearbox's on the two cars are the same (apart from ratio's/software of course) but you'd think they are pretty similar being based on the same VAG platform. When you drive one check it's not jerky going into one or two particular gears.
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