"Hmm, interesting no Idea what companies your talking about"
you assume i am in north america, with direct access to the company, it is not the case
most companies offer only 1 or 3 years, a 5 years pc won't have warranty
if you buy expensive ram with great warranty, good for you, the rest of us have to work with alot less
and yes, off topic
about the ram modules, verify if there is dust, dirt or any other weird substance on the ram module contacts, the copper surfaces on some ram modules under specific humidity situations needs some cleaning, sometimes you need to use a eraser to clean the contacts, alcohol can work too