If your power source is 110v the miner will run abnormally because Antminer s9 is made to run at 240v, not in 110v.

The PSU APW2 never heard this PSU before are you talking about APW3 or APW3?

Can you try to "Test hash board one by one"

If the hashboard running fine in the single hash board it means that the PSU is not giving enough power.
Solution: you need to buy a step-up transformer to be able to run them at full speed.