Question: Light not on when unlock vehicle

[Bentusi123]

Hi, everyone. New m3 owner here. Just got my 2016 f80 m3c few days ago. Love the car. Drive great.

Few days ago. One issue come up. Not sure if its there before. Sometimes the light not on when i unlock the vehicle. Either front or rear light. The only light on is the small one under door handle.
But its back to normal, if i start the vehicle And then switch off. The angel light and rear light all switch on when i unlock vehicle.

Also, after i switch off engine. Once i open driver side door. All light switch off. Is there anyway can make angel light stay longer?

Oh, The welcome light is on, The DRL is ticked. Light set in auto.

Someone told me it might be battery issue. But i don't have any warning message yet.

Does anyone have sane experience or know what wrong?

Btw, i did use bimmercode But everything recovered. Not sure if that is the reason.....