Samsung SGH-D807 / D806

My wife and I both have a SGH-D807 and yesterday I was trying to send files via bluetooth to her phone; however, they would not. I was able to turn the bluetooth on on both phones; however, when I tried to send a file from my phone to hers - her phone would not ever pick-up that I was trying to send a file. It just worked the night before - any ideas what might have happened or how I can fix it? Thanks! 😕