Make sure you have the latest updates...
Code:
sudo apt-get update && sudo apt-get upgrade
What gfx drivers are you using?
Code:
lspci -nnk | grep -iA2 vga
eg
glen@Quantal:~$ lspci -nnk | grep -iA2 vga
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF116 [GeForce GTX 550 Ti] [10de:1244] (rev a1)
Subsystem: Giga-byte Technology Device [1458:351a]
Kernel driver in use: nouveau
P.S. Next time the launcher disappears, if ctr+alt+t works to open the terminal, reload unity to see if the launcher appears.
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