2013 CX-9 Driver's seat issue...Any ideas?

My drivers seat won't move backward but it will move in every other direction. It started off not moving backwards unless I went forward a little first. The other day I moved it forward and tried to go backwards but it wouldn't go. After I played with the button for a while and it went back. Since there are 3 people that drive this car I need the seat to move.
Can anyone give me some ideas on how to fix this issue? Thank you!
 
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