Steve, thank you so much. That was really fast.
I just got back from work, started my PC, and installed v1.1 of wifi sync app.
And then, before I even plug my phone to do a wired sync, the wifi sync app located the server.
This is kind of embarrassing, but I'm happy that my problem is gone, at least for now.
I'll be sure to check out the error log in case it happens again.