Why is the Ford S-Max's automatic transmission shifting incorrectly?

Recently, my Ford S-Max's automatic transmission has been shifting incorrectly, causing a jerking sensation while driving. What could be the cause of this issue and how can I fix it?

This issue could be caused by a malfunctioning transmission fluid or filter. I suggest taking your car to a certified mechanic to have it checked and replaced if necessary.

Another potential cause could be a faulty transmission sensor. Have it diagnosed and replaced if needed, this should solve the issue.