Your suspicions IMO are groundless. Many users here, myself included, have had many various models of Kindles and Fire tablets. I've only had one device stop working...the first gen Paperwhite, and it was over 2 years old when it died.
My first gen Fire from 2011 is still working, as is the 2nd gen Kindle from 2009, and all of the ones in between.
When a user has multiple devices stop working, the common link is the user and how that they treat and use the device.
I have three Kindles. The newest one just quit working. The middle one keeps coming up with "Application Error. The selected application could not be started. Please try again."
Since this only occurred recently after Amazon offered a 25% discount for a trade in....
My suspicions are aroused.
"Newest"? Is it still under warranty? If so, send it back, then address whatever the problems may be with the others. Re "Application Error" messages, are those Amazon native apps or ones from the App Store or from elsewhere?
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"Not everything that can be counted counts, and not everything that counts can be counted."- Albert Einstein (1879-1955)
I guess you are right. I found instructions on how to restart my Kindles, followed them and now both are working. I love them. I have three but will soon have four. My daughter ordered another for me as soon as she heard two of my three stopped working. In addition to home reading I used them to pass the time while waiting in the parking lot for my wife to finished shopping.
But...you must admit it would be a great marketing ploy. Send a signal to disable a Kindle and them offer a discount on a new one. So I am paranoid.