Originally Posted by DrBob
Same problem. I deleted and re-entered my prints, and the phone worked fine for a day. Now it has forgotten them again. Back to the Genius Bar, I guess.
I'm no expert but I'm thinking that it's not a hardware problem, or it wouldn't be working fantastic for that first day, but a software problem. Like something in the software is forgetting the print prematurely. And being that it might possibly be a software problem I'm surprised that more haven't spoken out that they are having the same issue.
On Saturday I rescanned 5 fingers - right and left thumb, right and left index finger, and right middle finger. All worked fine until Sunday (yesterday). On Sunday both index fingers and my right middle finger worked fine, left thumb worked sometimes, and right thumb didn't work at all. Rescanned right thumb - my most used finger to unlock the phone. As of right now the right thumb still works great and I'm actually surprised. But left thumb doesn't nor does left index finger now. The biggest surprise however is that my right index finger and right middle finger still work with every attempt and I scanned those on Saturday.
I don't think I'm updated to 7.0.2 yet, so going to do that now, and the next thing I will try is just having one finger scanned, until I'm really confident it's working. Like 48 hours without a hitch. Then add another finger. If all else fails, my 14 days are up on the 7th, and I'll return to the Apple Store for an exchange. I'm just worried that they won't have my phone in stock. Ugh...