No personally with this model, but overall, if that is happening, it's too hot. The vent or fan is not effective. either too slow, or you have air flow blockage. one way to tell is to put your thermometer next to the bulb area. should be in the zone for t5 fixtures, look it up, I think it was a little over 100F. I'm suspecting you're in the 120F or higher. Anyway, look up the operating temp for T5s.