Yhat is the problem with the Rover transmissons, yes you drained off some fluid, but if you did it when the transmisson was at operating temp you bled off too much. They must be topped of after replacing the ATF and after onlt 1 to 2 minutes of running. You may not notice it now but you may be running a little low without realizing it.
Check the proper filling procedures and top off the transmisson accordingly.
Good luck,
Mike J.
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