I will occasionally (usually less than once a month) hear my name called out or someone say something like "hello".

I imagine that there is some auditory stimulation that is real that is being interpreted by my brain as a voice.

For me it is really frustrating, I can usually guess when it is a hallucination but I'll check in with those around me if they are trusted to be sure.

I keep record of whenever they happen so that if there is an increase I have a record to know exactly how dramatic the increase is.