Years and years of slamming the door closing can cause out of adjustment on your window channel and the angle of how your window travels. Here's how to adjust it.
Adjusting the center/front run channels.
-Roll window up
-Pop door panels off
-Follow your hand down the front channel until you reach a bolt
-Loosen and pull the channel closer
-Tighten
Test and adjust until perfect.
Adjusting the angle.
-Roll window up
-Pop out door panel
-Locate a bar that's connected to the regulator held on by 2 bolts. (Not the bolts that hold the actual regulator itself to the door.)
-Loosen the two bolts and "pivot" the bar a cm.
-Tighten.
-Test and adjust until perfect.
This controls how your window travels straight up angled etc. Little out of "angle" would cause your window to slip out of the channel once the window reaches the bottom because it is a lot wider and has some space for it to slip out.
Changing the regulator won't do anything as yours still work.
Coming from experience.
Hope this helped.