All tools are subject to malfunctions from time to time. The shotgun is in many ways no different than a pistol in this regard. Failure to feed, failure to eject, failure to extract, and a host of other mechanical problems can plague the shotgun. In my personal expierience I have had both autoloaders and pumps stop working at critical moments. While shooting a shotgun match at an IPSC event my Mossberg pump would not extract the spent shell, even after pumping the slide several times the hull remained lodged in the chamber. Solution: call a cease-fire and fix the problem. This past deer season my Remmington 1100 fired, extracted and ejected perfectly. However it failed to pickup the next round in the mag tube after the first shot. Thankfully I got the job done with that first shot . As far as how to fix malfunctions, prevention is the best solution, a clean properly lubricated firearm is less likely to fail. If it does fail imediate action drills can some times fix the problem. If that dosen't work transition to your handgun may be the best choice.