That happens if I set NB from 2200mhz to 2400mhz and it happens on ud3 board if I set NB from 2000mhz to 2200mhz
I see that many gigabyte users have that problem.
p.m. I tested everything for stability, I also added a lot of NB voltage, to see if it would help, but it didnt.
Wierd thing is, if I use FSB clock to overclock NB to 2400mhz Aero works fine.