2 tablets stopped charging after a year

I got the offer for 2 tablets, for my kids. One month before the guarantee expired my girl's tablet stopped charging. I called (good experience with customer service) and had it replaced with another and it works fine, but the next month my son's tablet is giving me the same problem and his guarantee expired by less than a month. Are these made to last or made to break down after a year? I expected more longevity from these.

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