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#1 fix would be to send it back to the factory for a fix. This is usually the best option for a new gun. Attempting a fix yourself will void the warrenty, then you'll be out money.
Other than that:
Clean the chamber THOROUGHLY, with a .38 caliber brush.
Inspect the chamber for rust, pitting, or rings.
Clean the extractor and ejector, and check for proper operation.
Especially check the extractor for proper spring tension, and free movement. The ejector should move freely in and out, and have a stiff spring tension.
Check the extractor and ejector for broken or chipped areas. The extractor lip may not be properly formed, and if so, won't extract the case.
Check the gas piston for free operation.
Check the operating slide for free operation.
Check the bolt for free operation.
If you have a gas piston wrench, and know how to disassemble the gas cylinder properly, you can check the gas port into the barrel to sure it isn't clogged or defective.
I once had an Iver Johnson that failed to extract and stovepiped. The extractor lip was defective, and replacement fixed it.
However, see #1 above.
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