2007 buick lacrosse, the transmission shifts hard,irestart it and it goes away . on 2007 Buick LaCrosse

but it will come back at a later day, and i will do the samething, and it will go away. what causes this

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3 answers 1 comment
DO YOU MEAN IT JERKS WHEN PUTTING IN GEAR OR SHIFTS HARD ON THE ROAD?
when i put into gear, and start to drive, when it changes gears. it will make a clunk noise when changing from first gear too second gear, and will do that until i shut off the engine and restart it. and it will stop. but it will happen again ,sometimes the same day or maybe a day later.
scan for trans codes or seek a free diag from aamco
My 2006 buick. Does that from time to time. Whats the issue. Id like to fix it