ideally 20% is the suggested battery percentage in which you should charge your car. Some say that you should charge it up until it reaches 80% but I guess it boils down to preference and your usage.
faulty 12v can cause problems out of the blue. have you contacted your local dealership about this issue? might need some professional hands to resolve this issue y'know?
It is the future of EVs, this is one of the great things about EVs than gas-powered vehicles. you have the freedom to customize your car and make it as unique as possible. subscription features vary nowadays and you can even choose from a list of features to add to your car. It is a great thing...