Ahh. Sounds familiar. I would suspect your plugs are fouling. Depending on what grade of plug they have put in - probably CR8Es or CR9Es, you could have a problem when the weather gets cold or you do short trips where the bike doesn't really get up to temp (I mean a decent 20 minutes or so). That would explain why it was all good when they changed the plugs. Check with the shop what they put in - you could go to a hotter plug (i.e. CR7E) without a problem provided you don't give it death everywhere you go. I had a similar problem with my Hornet and hotter plugs fixed it good.
Edit: It had me totally baffled. It would start fine in the morning, then I'd ride the (very short) ride to work, then in the afternoon when I went to leave it wouldn't start. Once started, no problem...
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