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Been going through the same issue on my '15 335i, just curious, are you running MHD by any chance? I doubt it has anything to do with it, but literally my first start up after flashing the E20 mix tune is when this all started lol.
This always happens when I start the car up after it's warm, like after a quick 7-11 run or something. Have to always put the car into the on position a couple times without starting, erase the codes before starting the car again, then start the car and it'll be good.
My friend and I have been looking into the issue with ISTA, so I'll keep you updated if we find a solution.
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