As far as the dynamic drive warning, it is likely the fluid in the system may be low, it is not uncommon for the front stabilizer bar to leak fluid. I would start by checking the fluid level of the power steering, this also incorporates the fluid for the dynamic drive system. It is a large black reservoir that state CHF-11S only on the cap.
As far as the idrive issue, it is likely just a programming glitch. 90% of audio related concerns can be rectified by simply updating the vehicles software. This is done by the dealer, and usually is a $250 charge for 2 hours of the technicians time to program the car.
Secondly, the amplifier in your model vehicle is also a known failure; this can also cause the static your experiencing, and can also cause malfunctions with the entire audio system. The system works on a fiber optic loop, and when one module is failed, the loop goes down, causing problems on the other modules. This can be diagnosed using a bmw scan tool, which the dealer can run a audio system analysis, to determine which module is, if any, at fault.
Sorry to say, but it looks like a trip to the dealer may be your least expensive choice, in order to not just throw parts at the car.
Hope this helps, please be sure to use the accept button as this is the only way I receive credit for my work.