What wrong with my Samsung Alpha, it's not receiving calls?

My brand new Samsung Alpha will from time to time not receive calls or texts with good coverage and never a problem with other phones in these locations. Diverts straight to voicemail but can make outgoing calls at this time just not receive.
I have exchanged the phone for a new one of same and changed sim card.
It is a lovely phone but if this issue persists it will be back for a refund.

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