so i'm sure i missed it somewhere in all the post on this issue but the problem was the power lift-gate would not go up or down ...it would just click and then latch back....so i replaced the lock/latch unit and it started working again and all was good.....fast forward 2 months and now it will not open....just clicks and then latches back ....i can however open it manually and then hit the button and it will close automatically with no issues....so do i replace the latch/lock again or could it be the actuator motor assy?????.....thanks for the help!!!

 

Try lubrication everything, hinges, ball ends of struts, etc. as any binding power lift will stop.
A weak strut, one or both can stop it from opening also. Weak struts or binding will not stop it from closing though.