HD No components updates on Fire HD 6

Hello all!

Glad to publish here my first post.
I've got one question concerning my Fire HD 6.
Since a couple of weeks, my tablet can't find components updates. I've made the last OS updates by USB (Fire OS 5.3.1.1). All seems ok. I receive my contents (books, magazines...) without troubles. But no components updates. Because of that, kindle and music app or Silk have not been updated. It's quite annoying, especially for the kindle app !!

I've already wipe all the content by a reseting to factory defaults, without success.

Any idea?

Thanks!!