I believe several generations of Samsung devices have a hardware issue with their flash storage that will make the storage slow down to a crawl before bricking itself. The problem only appeared a few years after release and it doesn't seem to affect every device either. Google and Samsung were most commonly affected if I recall correctly.

My old tablet suffers from the same problem. It's quite frustrating to use because of it, but luckily I'm only planning on using it for postmarketOS and that can boot from the SD card slot.

Other brands didn't have this problem and the problem has since been rectified in the Pixel/Galaxy lines. I suppose some very cheap devices may still be using trash flash storage chips, but it's no longer an issue with Android phones from the past few years.