should I be worried about the " FAILED"   ?  This particular S9 has one hash board stop working, a reboot fixes it for hours, or even a day, then sometimes  goes back to one board not hashing.... been in operation since Nov 21 2017

chain[5]: All chip cores are opened OK!
Test Patten on chain[5]: FAILED!
chain[6]: All chip cores are opened OK!
Test Patten on chain[6]: FAILED!
chain[7]: All chip cores are opened OK!
Test Patten on chain[7]: OK!