What is with the fire hydrants?

I haven't lived here very long, but every couple of weeks, at nearly 3am I am woken up by the sound of water hitting the pavement. I'm not taking rain, or windy/ stormy conditions, but a literal geyser smashing into the middle of the street outside my apartment for 15 minutes. I have reported a leaking fire hydrant to Houston 3-1-1, but after the 4th or so time, I'm wondering is this regular maintenance? I've lived near fire hydrants before, why is this one giving me the John Cusack "Say Anything" treatment on the regular?