Sharp???

Kinya,

Have you ever experienced harps going sharp over time?  This seems counterintuitive to me, but I have noticed that harps I use often, are reading about 5 to 7 cents sharp on the 4 blow and 4 draw for example.  It is perceptable to my ear.  I hear recordings of myself and they sound unpleasant.  This is compounded by the fact that my 5 draw is consistently running a few cents flat (on it's way to being blown out by me overplaying), so the contrast is noticeable.

Is the sharpness a sign that that these reeds are on their way out or should I just tune the damn thing and get on with my life?

Thanks,

Paul