I've been having trouble with my iPhone's microphone and tried everything to fix it, short of taking it to Apple. Today, I reset the phone completely after backing everything up in iTunes and iCloud. When I went to my Gmails, I discovered all my emails are now labeled "no sender" and there are no subjects listed on each email. I have updated to IOS 13.3.1 just today, after I reset it. Any help will be appreciated.