Smart lighting transformer humming

I have just added a third smart lighting transformer - it is functioning normally except that it has an audible hum and if you touch it you can feel the vibration.  The other two do not do this.  I'm wondering if there is something wrong with my transformer, and whether I should be concerned.  I am well below the maximum wattage.   All three transformers have LED lighting by others, but this one includes a strip light.  An internet search indicated there was some possibility that it would be inductive buzzing caused by the LED drivers.  Unless my new transformer is a lemon, this is the only thing I can think of as a possible reason. All three transformers are plugged into the same exterior outlet, but only the one has this issue, and there was no change in performance to the others when I added this one.  I suspect this is not dangerous, but wondering if it might diminish the lifespan of the transformer.  Any input would be appreciated!