Slightly different car, but I had these symptoms on my previous 850 T5... I bought a CSC, which was luckily external and an easy swap on these cars, arranged to get it fitted and it later turned out to be the hydraulic hose to the CSC... tiny leak from the hose, which gave the exact symptoms.
The clutch slave was changed anyhow since I had bought it, but the hose caused the issue.
Might be worth checking if your car has one.
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1996 850 T5, now 2010 C30 T5 R Design 
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