Comment 9 for bug 153518

"could somebody having the issue describe how to trigger it and maybe open the on bugzilla.gnome.org too?"

As I mentioned earlier, there is no particular action as such which needs to be taken to trigger it. Simply activate the turn on accessibility features from the Accessibility configuration dialog box, then activate Sticky Keys. The feature will remain active for some time, and then get deactivated on its own. Open the configuration box again to activate it, it will again work for some time before getting deactivated.