98 Civic DX Automatic Transmission Issue?

I have a 98 Civic DX, automatic and recently I have been noticing what appears to be strange shifting. For instance, when I roll up to an intersection and the light turns green before I stop or when I make a slow
speed turn (into a driveway for instance) and then get back on the gas, the transmission shifts down with a bit of a clunk (nothing too loud, just abrupt/rough). Also, when coming off the highway onto a ramp (and on the brakes) the car seems to be abrupt/rough when it downshifts (from 4th to 3rd).
Does this sound like a fatal transmission problem or might it be an issue as simple as new honda tranny fluid? Any suggestions? Thank you for your assistance.
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Spurr wrote:

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Knowing your mileage would be a big help, and you didn't say when you last changed your ATF, but it sounds pretty normal behaviour for a Honda.
Change the Z1 tranny fluid twice, and keep going.
'Curly'
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motsco_ _ wrote:

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if you had a manual, it would be easy to say it was the clutch. As Curly said, Change the Z1 tranny fluid twice.
janos
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OK. I'll change the fluid then. By the way, the car has approx 140,000kms. Thanks for your help everyone.

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