Have you updated to the latest firmware? That may help since the Note 3 is fairly new. It is not the number of contacts because I have more than that and no longer have any problems. But I DID. I had trouble with contacts with iPhone and Android and thought it might be a problem with either duplicates, odd characters or some such anomaly. I cleaned up all duplicates, deleted contacts I don't use or were incomplete. When I was done, I had pared down to about 100 and it works perfectly.
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