My phone kept thinking that it had a hands-free plugged in, so would intermittently mute the microphone and earpiece. Once I had taken it apart, I found some tiny metal shards under the headphone jack connections. I have no idea where they had come from, but removing them fixed the problem.
My phone kept thinking that it had a hands-free plugged in, so would intermittently mute the microphone and earpiece. Once I had taken it apart, I found some tiny metal shards under the headphone jack connections. I have no idea where they had come from, but removing them fixed the problem.