Yes, one of the board is weaker and generates an average of 30 HW per day but until it does not cause of dropping board, this situation is acceptable, because it does not make much impact on hashing speed.
My problem miner started out this way, but it has progressively gotten worse. Right now I have disconnected the board that throws the errors and letting it run to see how long the miner goes before issues appear again. If the board with the HW errors is the cause of my boards dropping then this should prove that out. I tried the one board at a time testing and sadly I couldn't reproduce it. So now I am more or less going at this "backwards" and removing the suspects as they poke their heads out of the holes. I can tell you this isn't a lot of fun.
How many L3s do you have Longsnowsm, or put it another way, what % of cards have failed or showing signs of failing? Just the 1 so far?