Shortcut stop working occasionally. Shortcut for snap to grid and switch foreground and background color don't work entirely.
*** Bug 373541 has been marked as a duplicate of this bug. ***
*** Bug 373540 has been marked as a duplicate of this bug. ***
Please update to Krita 3.0, Krita 2.9 is no longer maintained. The upcoming 3.1 release will have many fixes to the shortcuts system.