You need to get a dealer or independent garage to hook the car up to Volvo diagnostics (VIDA).
Suspension wise, faults could be coming up due to a faulty solenoid (or solenoids) on the shock absorbers. You may have a wiring issue, or maybe one or more than one the shock absorbers has packed in. 4c shock absorbers aren't cheap.
Volvo diagnostics is your best bet, otherwise its guesswork.
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2007 S80 2.4 D5 - 110,000 miles
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