I had a similar problem, random electrical malfunctions. Sometimes the doors wouldn't unlock, wipers would go on for no apparent reason, rear hatch would pop, a number of odd things. I had an old battery, 8 years, and the gremlins went away when I charged it. They went away completely when I replaced the battery. I concluded that because the X5 takes so much power, when the battery was low the components were getting an insufficient supply and this caused the random malfunctions. Not very scientific I'm afraid but you could give the battery a boost and see if it helps. Good luck