Ejector Breakage

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Hello All. Does anyone know what causes the ejector to break in a luger? My shooter luger that has thousands of rounds through it has had three ejectors break in the last year. The first was very pitted and lasted for years. The second was a repro and lasted a little more than 200 rounds. The third was from a reblued s/42 1936 upper that a friend parted out. It lasted a little more than 600 rounds. My load is on the lite side, 5 grains Unique and Lee 124 lrn. This load functioned the luger just fine but doesn't have enough power to activate the holdopen on most other 9's such as the p38 or hi-power. I'm thinking my recoil spring maybe to weak after all this time. Anyone have any other ideas? I don't remember where the first one broke but the last two broke about 1/8 inch behind the blade. I've been using this luger for 8-10 years and shooting 1000-1500 rounds a year. Thanks for any help. Bill