Over the past few months I've found my Vauxhall Zafira gearstick was getting a little stiffer and not selfcentering.
This video is about discovering what it could be, and trying a simple reseat and grease of the cables and turret on the gearbox to see if it helps.
If this doesn't work then my next choice will be to replace the cables linking the gearstick to the gearbox turret.

Enjoy watching!