I've had the same problem for a very long time, but my voices always say positive things. I've talked to a therapist about it , but because they only say positive things it's a conundrum. I've never hear a bad word, pretty weird. It's so weird I've tried to figure out where they come from , but I can't. I thought they were coming from some FBI communications device, but once in a while I'll here the same voice outside. The only thing I can figure out is that they behave similar to photons of light that when they hit the boundary between consciousness and sub consciousness they produce an incredible soft , clear almost undetectable sound in the form of a voice. They are so soft and almost undetectable , but very clear in what's being said. Totally weird. but fortunately very positive and life affirming.