EF auto problems

My EF has just developed a problem with the auto. When stopping, auto does not disengaged, torque convertor unlock and car shudders and stalls unless I manually change back into 2nd or neutral. Also when driving, changes from 2nd to 3rd and 3rd to 4th, the Torque convertor locks straight away (revs drop down). Does not matter if in Economy or power mode. If I accelerate normally, car struggles until I push down on pedal harder, kicks back a gear and works normally until I back off, changes to 4th and locks torque convertor.

Any help would be good.