Yes I beleive they do even if in a way that we can't really understand. It is a spirit connection I think. As spiritual beings having a human experience it just makes sense to me that our spirit connects with all other spirits. Those having a human experience with me or without me. In spirit there is no time so spirit can travel through the times of all human experiences.

I think when we hear a voice it could be a spiritual connection. Spirit speaking to spirit. Or it could just be hearing something we might expect to hear if the loved one were still present in human form. Either way it is a connect that is precious. It is love that allows a loved one to speak to us one way or another.