Our 1995 850 turbo sedan has been a great car for the last 17.5 years and 200+k miles. Today, with temperatures in the mid-80s, after 2 hours of hard driving in heavy Chicago traffic (because we wanted to be at certain places within a specified period of time), the car would upshift up to the 3rd gear, but not into the 4th. After it was parked with the engine off for about 15 minutes, everything turned out to be fine again. Has anybody else had such an experience before? What would such a behavior suggest? Otherwise, everything in the car looks normal.
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