Yeah if battery voltage is dipping could clear the memory
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Yup had the exact same problem with a e39 key. You will probably have to end up reprogramming it more and more often unless you get a new battery.
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E36 318is avus blue
E36 318is cosmos black
E36 323i coupe cosmos black
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E60 520D LCI Titan silver SOLD
E60 520D mystic blue