LaunchPad keeps appearing automatically?
My Mac is running El Capitan 10.11.3
Everything works fine. Out of a sudden, the LaunchPad starts to appear automatically. It appears suddenly and I press ESC or click mouse to make it go away, it will appear again after couple of seconds or sometimes longer, 10-30 seconds, or minutes. Sometimes it appears so frequent to bother my work.
My keyboard shortcut for LaunchPad is disabled, no hot corners are set for it.
I actually don't use LanuchPad at all. It's not even in my dock.
I feel really strange about this. I am thinking to re-install my Mac. But it's the last option. Anyone can help on this? (I have been using Mac for 5 years. This is the first time I see this)
iMac (27-inch Mid 2011), OS X El Capitan (10.11.3)