I have a new PSX4 unit. During the first initial install and test 1-3 passed and caught a short, then the 4th did not catch the short and the booster tripped. After that first test all 4 units on the PSX4 failed repeatedly at catching a short doing the units initial testing routine (which is simply connect it normally and short it at the output terminal). Not sure what to make of 3 working as described initially then not working, with absolutely nothing changed or even touched. To try and fix it I messed with the devices CV values to adjust the trip current, at setting 1 of around 1.27 amps one unit caught a short once, then continued to let the short pass through to the booster which tripped. I then adjusted the DCC++ currentmonitor.h settings from 300 to 750 which should allow around 2 amps which I am not sure applies to short circuit sensing or just track power? Still the arduino/pololu control station is tripping not the PSX circuit breakers. I have tried resetting to factory several times between attempts at current trip value adjustments in the 1.27 to 5 amp range. Any advice?