The auto-pay date has been messed up for quite a few people. For me it was lagging almost a week after my renewal date. It was related to some maintainence that was performed which for some reason messed with the dates. Odds are if it isn't just random network glitch that reporting your phone lost/stolen then waiting a few minutes and reporting it found fixes (and/or adding an extra dollar to your account) that it is related to that timing glitch. I suppose it is also possible that it didn't successfully take the payment if your payment method is expired too, but I assume that isn't the case.
If you have a plan that has limited minutes, you might have run out as well.
If it just reports expired (I think that is what it says, might be suspended) on your account, but your service is still working, that is normal for renewal time.
