My CS4 has been great for the last year. But I have only been using it to fill guns. I recently acquired an SCBA tank and since I started filling the tank, the compressor will shut off. I don’t know if it is some kind of fault protection but when I try to press the start button again it won’t start. If I relieve all of the pressure allow the fan to run and cool it down and unplug it and let it sit for a few minutes and plug it back in everything works fine. I am usually running it for 30 to 45 minutes when topping off the SCBA. Also it won’t fill the bottle past 4200 psi. Fills tubes and bottles on guns to 4500 no problem but just can’t seem to get that number on the SCBA.