Its a safety feature of the regulator. The regulator is designed with a pressure release valve. This has happened to me twice: once with a carbon dioxide tank for my kegerator and once on my propane stove. In both cases I left the regulator (designed with a max pressure rating of X psi) attached to a full bottle in the sun. The heat caused the pressure to exceed the limit of the regulator and the release valve popped. A welding supply store may be able to reset/replace the mechanism but in my case I just bought a new regulator for about $15.
SOURCE: need to fix regulator for coleman stove 5410708
Just where the regulator attaches to the burner there is a small nut that may be loose. If you look closely at this and turn the regulator (stove off and hose detached!) you may see the nut hat turns easily. Tighten it and make sure the regulator does not rotate too freely, but still turns to adjust when attached to the hose or the smaller gas cartridge, if using that. Test carefully after this.
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