I'm concerned about an Amazon Fire HD 10 tablet that started showing ads on the 'lock' page without warning about 5 days ago. Amazon will 'unlock' your Amazon device from the obtrusive ads for $15. My investigation determined that Amazon claims that the tablet was sold at a discount in order to add ads, and that's why they are charging $15 to remove the ads. Well, odds are that Amazon turned the ads on last week when my device started showing ads after a software update. What is really unsettling is that this device has no access to the battery...