RE: unpredictable starting
I've never had this problem with my A3, but I wouldn't worry about the dash power dropping out. When you turn the ignition, most of the battery's power is going to the starter. Normally you wouldn't notice the drop because the engine turns over immediately and the alternator kicks in, but if it is hesitating while starting then you will notice the power drop out.
Not sure what to tell you about the rough start, but I don't think you have to worry about the electrical problems.
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