Need to check the settings on my account, did not get any email when electrobits reply back.
It is not true all my Antminers broke, only the S7 and S9 broke, the 3 S7 last 6 months after that stopped hashing one board at a time until all the ship shows X in all boards, the 3 S9 last 2 month to 3 month, after that the miners only hash for 20 minutes and gradually decrease the hashing until stop.
I had S2, S3 and S5 all working since 2013 but when I get the S7 and S9 I trow all the old ones to the garbage because of the noise and the power consumption.

At the end the only one working is this BTCGarden, by the way I found the problem on board 2 after testing board by board, I moved it to the last position and disconnect it, it is hashing steady since. When checking the board I found the aluminum oxide from the chassis dropped over the board, the chassis has a plastic protection outside but not inside, before I put it together I paint the inside of the chassis with rust oleum so it does not happen to the other boards.

For what I see, whoever design the BTCGarden care more about quality and endurance than profit and did the boards design with more space between components and more heat sink cooling area making the miner to run cool, with less fan speed and noise making the fans to last longer.

What you mean by main bits?