Yes i had this problem with my secondhand bmw 523i too from ppsl.
How to fix bmw interior door handle.
Only changed the ones in front even though the rear door handles are also a bit sticky.
Stitch the leather cover edges start sewing the cover edges you can stitch by every stitch eye or by every second stitch eye.
People are not aware that this can be fixed a very reasonable cost so they end up paying exorbitant amount at dealership.
If you go to dealership they will ask you to replace the handle or the entire door.
Had to spend a few hundred dollars to replace them.
Its not a very simple job to fix it but it can be done.
How to replace sticky inner door pull handles 2012 bmw 328i link to handle replacement on amazon by jaronx.
I suspect it is due to the fact that i park my car in an open carpark.
Repair sticky bmw inner door handle using leather cover easy diy solution.
Install the new handle grabs using the supplied screws and washers.
Installing bmw 3 series e90 e91 e92 m3 passenger door handle cover leather cove.
Reinstall the door pad and clip the outer handle cover in place.
Install the cover on the interior door handle make sure that the edges allign with the door handle edges.
Once all of the plastic weld is removed gently pull out the handle grab a rather messy task.
So we thought of writing a blog on this and sharing the pics of recent job done on a bmw x3.
With the handle removed its a good time to apply some leather cleaner optional.