Who's your mechanic in SD? Try getting a second opinion from another shop. It's very possible that a mouse or rat has crawled into your engine bay and maybe chewed up one of the wires, as what you describe is similar to a bad electrical connection. I'd have the car thoroughly inspected before dropping good money on a ECU.
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2006 Z4 M Roadster Black/Imola Red, FBO VF-Engineering, e85 Flex Fuel-Sold
2012 BMW 135i N55 DCT Alpine White/Coral Red, FBO, TBI, Full e85, JB4 BEF-Sold
2006 Z4 M Roadster Black/Black-Sold
2021 M2 Competition DCT Hockenheim Silver
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