First thing to check with auto transmission is that the transmission fluid needs changing every 60,000 miles or I think 4 years. this must be done using the correct fluid not just a general auto box fluid.
What age is your car and what is the mileage? on the earlier jatco box there was a problem with one of the actuators I believe that was changed for a modified part at some point.
have you tried a battery off reset,? disconect battery for 15 mins and this will put all the ecu's including the gear box one back to default mode worth a try.
Richard
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