It sounds as if there's a module or sensor that might be faulty, possibly the Transmission Control Module. It sounds as if the module/sensor isn't telling the transmission to shift.
Has the transmission had a fluid service?
Is the fluid level correct?
No banging or clunking into gears?
Transmission software ever been updated?
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2007 S80 2.4 D5 - 110,000 miles
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