Your DSC module is Failing. It is temperature related. My DSC did the exact same thing. I repaired my own DSC module and the bimmer has been running great since. You need special tools to do the job so it isn't for everybody. If you want to see for sure if your DSC is failing, remove your drivers side headlight and bracket. On a cold morning, don't start the X5.
Heat the DSC module with a hair dryer (get it good and warm) Start the X5 now and immediately drive it. If the X5 operates normal you know it's the module.
Good Luck!