Dang that's a bummer NotFuzzy. A good R4 is like a unicorn; you've heard about them but don't really see them!

Even my R4B2 is mostly R2B2 anymore with only one board that consistently hashes. Might need to do another cleaning.

the good unicorn is the first batch of T9. I have few and since running non stop. 2 of them once made 183 days straight.