Mine stopped working today too. Tried everything- restart, resetting & reordering panels, force stop. All just made it worse. At first, couldn't swipe past 3rd panel; now can't swipe past first -- just crashes. Sent detailed error report.
Temporary Solution: Remove the Clipboard app from the panel if you're using it. Following the last system update, Clipboard seems to be causing the freezes and crashes. (Samsung did not provide a solution to my error report, naturally).