Ya if you have had that much bad luck with the same board in the same miner you should start trying to narrow down the cause of the problem and start looking at your power supplys as well as all the wires and plugs going to the board in ? that keeps dieing on you. esp now that they have had to of been plugged in and unplugged a few times now just from dealing with the board issue so many times. PCI-e female plugs are only rated for a maximum life of 30 cycles of plugging them in and unplugging them before failure even in the best conditions. They really are not meant to be unplugged more then a few times in their life before they need to be repined. and really not even meant to be pushing as much amps as they do when used in something as power hungry as an s9
and if its not a power supply issue or plug and wireing issue I would start looking at things such as the fan or what sort of temps the air intake air is at where ever you are running the miner that keeps haveing a board die on you over and over.
Or you could just have really really bad luck. Which can happen.
before i get the board i moved this machine to new apartment that have more good air flow because we are on summer now
and changed the PSU too from EVGA 1600G2 to APW3 which i get it from one month from bitmain ( i have only one APW3 )
when this board stopped hashing i tested it on another data cable and start the machine with it only but it still not working