Lubrication is always a good idea, but sticky joints are seldom the problem.
Most often the hydraulic system is failing, possibly low fluid or a failing pump or cylinder.
It takes an enormous amount of energy for the motor to raise the top because the cylinders are attached to the frame where they have very little mechanical advantage.
An hydraulic leak can often be found by removing the rear seat and backrest and looking for ATF spots. Remember a leak will often travel along the lines before dripping to the floor.
If you have a bad line, replace them all, if a bad cylinder is the cause, replace them both.
When you refill the hydraulic reservoir, use ATF and always fill it with the top up.
Cycle it a few times and fill it again. Repeat till it will take no more fluid or the top works properly.