Reading through these oddball problems with temp sensors and blinking lights I was wondering if there could well be a link to it being shipped and the handling of it? As you said you havent had any problems with testing but now people are having issues and the only common factor is shipping or possible storage (although these are selling like hotcakes so I doubt its that).
Could it be possible something has become unseated/worked loose?
P.S. sidehack please dont take that as a slur on your workmanship. I love your gear and its robust build quality 👍🏼
If you take a look at the Apollo LTC miner discussion you can see jstefanop had some shipping issues with them. They were shipped in a very sold box that was very well padded and people still had miners coming in damaged.
Mine came in yesterday and is hashing away with no issues. Can't get it above 750G, going to play with it more today.
-Dave