What cell phone carrier do you use?
I have this problem when my verizon phone is also trying to perform data functions while I make a call. Verizon does not allow simultaneous use of data and voice phone, so if you make call it suspends data use during the call. However, if you using iDrive or other apps that take advantage of data use from your phone when you make a call, it seems to make the voice call flaky. I get static and frequent call drops when I am using my phone as a hot spot for Connected drive apps or when using Waze or Escort's (Radar) app.
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