Why do my conversations on my cellphone keep failing?

I have a LG Xenon phone with Rogers and everytime i talk with that one person i here a loud beeping and then my phone says Network Failure and drops the call, i call this person almost everyday for atleast an hour and this keeps happening, none of our other calls do this just the call between us. Any explanations to why this is happening? (This also happened with the previous phone i owned)
 
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