Sorry to hear you're still having problems. I have the same issues, battery drops to 10% when parked sometimes within minutes but apparently charges back to 80% on short run to work. I also have hybrid TV tuner (which works fine) I found a persistent voltage drop (35mV) across the 10A fuse to TVtuner circuit (third one down left hand side in the boot) even after car was parked and switched off for several hours and on this basis started pulling the fuse every time I parked and this has stopped the battery drain. Dave at A8 parts has been very helpful and we decided on MMI software upgrade to 5570 on the basis of the TSB which gave this as a solution to persistent drain from failure of this module to shut down. It seemed to work for a couple of nights but then recurred and battery was barely able to crank the starter. Downside of the upgrade was my bluetooth phone has disappeared!
I'm also suspicious the battery manager is not allowing a full charge of the battery when indicating the too rapid rise from the 10% level (we decided to switch the battery meter back on) and that the battery is chronically undercharged so I'm currently giving the battery a long session on the conditioner charger before looking at trying replacing the battery ECU. What do you mean when you say you manually switch off mmi and how do you know how long it is taking to shut down modules? I kind of feel I am getting closer to a solution but it is seriously frustrating as I have also suffered the broken gear tooth on the MMI display and am going to try the brass replacement repair.
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