Fine art, your post. Let me tell you i am working with several Buffalo storage solutions for years too. I really do not think that you can tell me from one or two postings that you have more experience than me, sorry, alot more...
So if you cannot proof your experience or you are unwilling to do, please don't annoy others with such my-is-bigger posting.
Back to topic: As long as you really proof it, E04 IS a Flash error, despite what you say! This has nothing to do with believe or not, only with facts. My TS does only come up with E04, with four drives, with three and without all drives. No normal operating, no EM.