Sad story!
The first thing that comes into my mind is that when the input-seal on the gearbox broke it leaked a bit oil on the clutch. Do you know if your clutch got checked when they changed the seal? I guess not, because it’s not possible without taking the clutch apart.
A friend of mine had problems with the same seal a few months after he bought the bike, but it has worked well since (60kkm+)
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