we're getting some ice crystals forming inside the fridge

Liz, thankfully this is most likely due to the door being left ajar, or not closed completely. The warm air gets inside and causes the crystallization you see. But leave it closed up, monitor it, and all should be well. You can even use a thermometer in a glass of water if you want to keep a precise watch on it. If you keep noticing an issue, let us know!