You will need to check your X from outside without touching, arming/disarming or opening anything tro do this check: See if the LED on the shift lever goes out after abour 30 minutes. IF it stays on then the sleep mode is not cutting in and you get battery drained problems. If you are still covered by warranty then let the dealer check why but be advised they can & will blame after market retro fits such as your V1 and will charge you. So disconnect anything non OEM before you take it in. Modules can and will go bad and these can be the source of the problem.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i