Having the same exact problem and it started exactly when jgpuck's did. Often I set the password to exactly what it was before, the same password I've been using for years. It may or may not let me in but it only works for a short time. Tried a completely different password-- same problem. There is obviously something wrong. For me the problem is limited to smartphones and the mobile site. And yes I've already tried clearing cache and cookies on the phone and doing a battery pull.
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