I've had this problem once this winter but a 40 minute drive dispatched the issue.
This is pretty much the fate of modern cars. If you had a car built in the early 2000s it was built from mostly with 20 year old tech. If you had a car but from 2008-9 on the tech is 10 years old or less. In-car computers are a good example. Previously specially built machines they are now on par with laptop computers with full blown operating systems, hard drives, memory, etc . Laptops are powered by lithium batteries and charged often. Your car? Lead acid batteries charged a little bit each day. So a 100 year old tech is powering 10-15 year old tech. And that's just one system. Your new BMW is so complex that the traditional control network of devices may be replaced with a network more akin to a typical office rather than a car. There are just so many devices.
The answer might be to add a second battery but most manufacturers will avoid fixing annoyances unless customers get really ticked off. If you already trickle charge your car, welcome to the future. Most car owners will be joining you soon enough.
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