Double check the grounds and the positive cable from the battery to the alternator. Make sure to take both terminals off the battery and clean them up so they're nice and shiny.
Next, get that alternator tested free at an Autozone or something. Then double check your fuses.
The only other thing that could make sense would be if your ignition switch is shot - the part where your key goes in... If that is all screwy your car will "randomly" not "see" that the key is in it - and as such will kill all electronics.
If you ever go to start it and you don't so much as hear a click or any lights come on - that means either the battery is 100% dead, the cabling/grounding is poor, or that ignition switch is screwed up...
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