I dont now if  anyone noticed the "freezer trick# in this video posted above, https://youtu.be/F6L9hCQ4OhY ,I had some parts of it tranlated by i russian speking friend, and it turned that some hashboard problems can be detected by freezing the board, and there after run it.

I took the hash board board

• from the T17, that droped off or didn't start, that on irregular bases, (in awesom showing ...4 of 30 asic...) and put it in the freezer for a couple of hours, and it felt stable there after, now on day 2, been minning normal and also starts normal on multible power cycles.

I dont know the exact mechanism for this phenomena, as the dude couldn't explain to well, but as its known that bad quality of solder composition/flux, migth be affected by prolonged heat exposure, resulting in bad solder joints due to  crystallic changes in the solderit self. The process of freezing migth some how mediate some  transformation the solder.  Let see how long this fix will hold... Worth trying on such boards.

To the other board [1] i attached the heat sink with thermal glue but to no awail, still showing (..24 of 30 ASICS..) freezing did not help on this one,