Dimplex electric fireplace

We purchased a new 2013 Outdoors RV Blackstone in May 2013. For three years no problem with the fireplace, then last August on a trip to the Eastern Sierras, when we arrived at the campsite, the glass from the fireplace was broken all over the floor. We had stopped for lunch just 60 miles earlier and all was well. I assumed it was just a fluke thing and replaced the glass. Yesterday coming back from Disneyland, when we got home, once again broken glass everywhere. Neither time did anything hit the glass. Has anyone else experienced this?