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Battery low. take a long drive or put on charger. My '13 M5 just had this few days ago. Put it overnight on Ctek 7002 charger on normal mode and 24 hours later fully charged. AGM batteries have slower discharge so a good battery should hold for quite awhile after being topped off.
If you trickle charge you might want to make sure you use the AGM setting on your charger so you don't toast it (if your battery is AGM type).
My M5 has basically sat for almost 3 months now with the dreadful northeast weather (snow, salt, sand). I usually start it and let it run for 5 or 10 minutes and roll the tires so no flats every 3 to 4 weeks but that wasn't enough and needed a charge.
If you still get it after a charge your battery likely needs replacement
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