Samsung S5 ringing but not correctly

When called, the proper ring tone sounds for a very short time and then stops (sounds "funny" as it stops). Then, after a brief pause, it will go back to ringing again. This cycle repeats for as long as the phone is ringing.

I have tried restarting the phone, changing the ring tone, etc. with no effect. It has not always done this.

Thanks for any help.

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