my wife's 325i touring recently also got a battery replaced.

reason is that she drives short distances only, which does not allow the battery to fully power-up. perhaps that is also in your case ?

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MY '06 E91 325i Touring "High Executive" and MY '06 E81 130i "High Executive" Color: Monaco Blue, Interior: black Dakota leather, Transmission: manual 6-speed Other options: sportsuspension, AFS, (panorama) sunroof, M-Sport headlining, Bridgestone Potenza RFT, ACC, LOGIC 7, PDC, foldable mirrors, ski-bag etc. etc. etc.