If your battery is over two years old I would look closer there. I just went through the same thing with our BMW. The battery checked fine but would go flat every now and then. I bit the bullet and bought a new one and that was it. Good luck.
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1995 Porsche C4 Cab
2016 BMW M2, 6 Speed LBB - ED 7/2016
1997 993 Cab - Sold; 1997 993 Turbo - Sold
2001 Boxster S - Original Owner - 30K Miles -SOLD
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