Van dies - after turning off the engine

My Kia Sedona (75K miles) dies right after I press the engine off button. When I say die means - everything is dead. No lights, no power windows, key does not work, cant close doors, etc. I have to do a jumper to turn it on. Recently Walmart said the battery is fine. I am not sure what is really going on.
Any has faced this problem?
Any has faced this problem?
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@KiaSedonaFrisco
Did you ever find the cause because mine is doing that exact thing now.