Memory just like all other PCB boards is made with the same possible ways of defects. And when the BGA fails. the memory disconnects, and fails. and you get lots of weird errors.
One of which the memory leaking and giving you dots on the screen .. others you wont be able to turn on the computer. The memory is the most necessary component next to the CPU and the Motherboard. With out the memory you can not have anything post! or the Motherboard even turn on. DDR 1 2 3 4 and now 5 all suffer from the same issues. SoDIMM RDIMM or any other types have the same problems.
Memory chips on Macs, Surface pros, and just about any electronic device .. will fail.. if not today it will be tomorrow!