do you mean 3 out of 5 mags where they all started freshly filled?
i take it this is a green gas single stack mag? and the recoil feel drops off pretty quickly as you fire?
i'm still wagering on it just running out of gas, especially if it's a single stack green gas mag trying to move a metal 1911 slide in winter, you could down-load the mags to ensure reliable lock back, or you could defo try more powerful gas (although even on black it could struggle).
otherwise it's just a case of keeping the mags warm or consider getting a co2 sidearm (or tm hicapa because nobody doesn't need a hicapa in their lives) for the colder months (this is literally the only reason i still own my co2 1911)