That's what I was told by my mechanic, when I had the fluid changed in the transmission of my w124, it started not shifting and was acting as though it was going out. But a few weeks later it was back to normal 100%. I would say it just needs some time to adjust.

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76 MG Midget
78 Datsun 280Z
86 Peugeot 505
01 Subaru Outback

“Owning a car is like owning a dog. Every now and then, it craps on the carpet — but it’s still your dog.” - Jeremy Clarkson