crown molding - cracks

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Put up crown molding in dining room last August. Looked great then, still looks great. But just noticed that if you look closely, small cracks have opened up in a few places between ceiling and molding. Almost all on exterior wall, so I assume temp change (cold weather) has something to do with it. No problems on interior walls. I can caulk and repaint, no problem, but I hate to think that I'll have to do this regularly... Am I correct in thinking that this is a one-time, temp-related problem? House is 10 yrs old, so I don't think there are any settling issues.