My Azoo regulator has leaked alot of CO2 from my fire extinguisher setup. In the past week it has gone from around 1000psi to 500 psi. I could actually hear it leaking from the location circled in red in the photo below. What is this? Why did it leak, and why does it not seem to leak now? Is there anything I can do to prevent future leaks. All input really appreciated, as I have only just got set up with pressurised CO2, and now I am without it again :?