Sorry if this is well-trodden ground:
When I bought my Vespa I was given one blue key. Had Robot duplicate it at Scooterwest. I gave him the card with the code, and he handed it back to me saying I could just throw that away. Said he didn't need that and I didn't need that. The new key worked for a bit but now it will only unlock the steering and the seat. Scooter won't start with the new key now after 3 months of it starting with no trouble. Luckily I still have the original key that starts it up with zero issues. You know, until I lose it.
Any insights as to how a key could work for 3 months and then no-go?