First time it happened, no big deal. We just power cycled the machine and it went away. One drive in a bank of them dropped out mid-shift: the fault said something about "F111 Safety Hardware". Machine just shut down and wouldn't run. No E-stop pressed. No gate opened. Safety relay had all green lights, no issue there. After power cycling, the machine fired up and ran the rest of the shift with zero complaints. Then nothing for three weeks. Then it came back. Once a week