If it was just one, I'd put it down to random bad luck. But with that many failures I assume they are doing something stupid/cheap.
Usually they would simply fail to power on but sometimes individual slots seemed to die (which RAID just loooooves).
And having an entire enclosure fail and waiting days/weeks for a replacement sucks as you lose access to all your data.
I eventually bought a Jonsbo N3 off of Aliexpress and PCI SATA card (to support more than the 2-4 drives most motherboards support) and that has been working well for months.
The Jonsbo N3 is not comparable. I own one as well (how quiet is yours? I upgraded the rear fan but my CPU fan is noisy), but it's a complete PC case, not an external HDD array.
There is one deeply troubling flaw to them though, they don't turn back on of the power goes out, until you physically hit the button again. I think this is alas all to common for many of these enclosures!