When I need to open a terminal I press `Ctrl`+`Alt`+`T` to save time. Most of the time absolutely nothing happens, I try to press same combination again, and still nothing happens. After like 5-8 tries terminal window finally appears. Sometimes terminal opens on a first try.

This is a very annoying situation.

I also noted that open rate increases when I click on random spot on my desktop when all windows are hidden.

Also, when terminal finally is open, next `Ctrl`+`Alt`+`T` combinations open new terminal window immediately.

There are no loadings when combination does not work, which means terminal will not appear even if I wait.

Ubuntu 12.10

Current computer:
ASUS P5K-E/Wifi-AP MB, CPU Q6600 Quad Core @ 2.4ghz, GFX GTX560Ti, DDR2 RAM @ 800mhz 4gb

What am I doing wrong? Maybe there is some "focus" in shortkeys, global shortkeys, etc?