@MrBamboo two things.
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Please make sure to Search Before Posting in the future. Many times the answers to our questions/issues have already been addressed. Opening duplicate topics is not helpful and instead can be a distraction and/or annoyance.
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As an example of the above, the answer to your issue can be found at Keyboard shortcuts suddenly broken - #5 by fallaciousreasoning
You also would have seen me say the exact thing to someone else with your issue over at Change unwated shortcut