I agree with Clan, check gearbox oils etc first.
Neutral stop is nice to have and it evidently worked at some point, so something has worn or gone out of spec. I suspect one of the gearbox valves has gunged up and is moving too slowly, but I have never opened one of these.
In older automatic cars (e.g. my old Sunbeam Rapier) we could empty the gearbox/torque converter oil and then run new flushing oil through the gearbox for a couple of miles and drain it and refill with the right stuff, but I am not sure we would get away with that on one of these boxes?
Mine (V70) improved as soon as I changed the gearbox oil but it's slowly gone back to thumping again since then.
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