Why won't Doro 5030 ring sometimes?

The Doro 5030 is new.  It sometimes fails to ring but turning it off and on again recommedies this.  Clearly we cannot turn it off and on again several times a day - we need a phone that is reliable.  We are wondering if it is faulty and we should return it?

Hmm. That's odd. Does it still receive the call but not ring at all? or you just don't notice it ring and miss the call sometimes? Try changing the ringtone to a more attention catching one.

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