My score dropped more than 30 points just two weeks ago and has now recovered those points and then some. The best I can understand is that two auto loans that were refinanced have reported as $0 (caused the score to go from 580 to 620) and then a new credit account was added (another 3 points).
I'm happy that it's back up but frustrated trying to follow the logic. I think I'm just going to ignore the actual score and keep paying my bills on time. When we are ready to do something with our house I'll check again.
Thanks for the help everyone!