This has happened to me multiple times, more so when I was younger but every now and again it will happen again. It used to be my mothers voice, and then it switched to my fiancé's voice.
I remember one instance when I was younger of hearing my mother scream my name, as if she was hurt and needed help urgently. It was pretty late, around 11 at night. My blood ran ice cold and of course I ran full speed into her room and burst through the door, only to find her sound asleep and completely oblivious to me crashing through her bedroom door like the kool aid man and then standing there completely and utterly lost for words.
I've heard her voice yell my name quite a number of times, only to discover she's either asleep, reading quietly, watching tv or even worse, not even in the house at all.
Since my partner moved in, I've heard him speak a number of times except it's never him. It's even happened while he's sat right next to me. I've heard his voice, asked him to repeat himself because I didn't quite catch what he said only to have him tell me he never said anything at all...
Funnily enough, I've never experienced this while looking directly at the person who's voice I'm hearing.
It's not on a loop, and what I mean by that is that it's not residual, it doesn't follow a pattern or a routine and there's no deja vu either. It's just completely and utterly random and out of the blue.
I always have this horrible fear that one day I'll hear either my mother's or my partner's voice shout my name or shout for help and I'll go running and bump into something that's not and never has been human.