iphone 7 plus echos intermittently

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In the past few months my iphone 7 plus began to echo while I'm in the middle of a phone call.  It doesn't happen all the time, but seems to happen once or twice per day.  When it happens it usually lasts 15-20 seconds, then goes away.   It sounds like an old fashioned broken record, skipping and such.  Any one know how to fix this issue?   I'm on my phone a lot (for work) so this is a real issue for me.  Gracias. 

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