Same garbage happens to me too !!!

I got Prime95 version 26.4 SmallFFTS for 4(four) hours stable at 4.9 ghz(2600K) than memtest for 1 hour with memory at its rated speed 2133mhz, all stable. Than I get happy that this is my 24/7 clock and when i shut down the system for 30 minutes and decide to boot up - CLOCKS FAILED and the thing reverts back its BCLK from 100.0mhz to 99.8mhz and memory to 1333mhz CL9, but the CPU remains at 49x99.8mhz ~4.9ghz. So i have to go into the bios, set all settings, save and exit and than it loads fine. But this is everytime, so annoying, for about a week now ! Gigabyte, look into this please.