Transmission & Drivetrain for Jaguar S-Type "adjust band brakes" Questions

why did my automatic transmission stop shifting? my automatic transmission stop shifting when i put it in drive. This is a vague questions without stating the year/make/model. There are several things

...when braking(when trans is down shifting) it shif 4.0l non-superchared 1995 vanden plas Adjust the tricky trans band in trans make sure gears arent shredding away and torque converter is up to ...