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Now that is weird, perhaps you can find an app to monitor your connection to your carrier and see if it is having any intermittent issues.

There is a method where telemarketers and others can bypass your phone and get themselves sent directly to voicemail. If you are receiving voicemails you would normally ignore then this may be your issue. https://www.nytimes.com/2017/06/03/busi ... keter.html