Accord early / sudden down shifting...
 

Hi,

for some time now I have been experiencing an 'early' (/ sudden)
downshifting on my 94 accord.
This seems to be more pronounced in D4.

For example, it might be down shifting from 2000rpm to 1500rpm.
Also sometimes it downshifts when I let off of the gas pedal.

Nothing really pronounced, or that makes the car 'undrivable', but
still would be good to get an idea why it's done or how it would be
fixed.
Also the fact that many times its running on low rpm feels like it's
more unresponsive than it should.

Note that I changed already twice the transmission fluid twice
the last 2.5 years without any obvious effects.

Any ideas are welcome.
TIA
michael