If your not getting a signal to injector, just trace it back to the ECU; there could be a dodgy connection somewhere.
Could be happening more often when your on it, as there’s more heat, movement, vibration.
The other option, is what occurred to me. I had a cylinder keep cutting out every now and then. Two days later that corresponding injector driver in the PFC died. Had to send it back to Apexera to be fixed.