Same happened to my friend and after several trips to the dealer it turned out to be a bad battery....worth checking it if you haven't already.

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers