Generally when an oxycon does that, it means that it needs its filters changed or it's got a cracked hose inside it. My advice would be to find a manual for your machine and study it thoroughly, then order a set of replacement filters. They aren't all that difficult to service yourself. If it's a cracked hose, surgical rubber tubing is fairly easy to get. There's a lot of information on this website about self-servicing oxycons, so do your homework!
Oxygen concentrators are medical devices and they are built to shut down if something inside them goes wrong. Oxygen in high concentrations is not precisely flammable, but it supports flame, and if an oxycon started leaking large amounts of oxygen while some idiot is smoking nearby... you can see the problem.
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