i have got an asus crosshair mobo and it has auto OC since i'm new to it and i keep it on auto but when i go into gamws i can change it to AI -OC where it OC's it self ,latety runs fine for bout 5or6 hours then jus restarts is this the overclock or PSU ? i also have had problems auto updateing the bios from asus it same there no proper bios image on sever file and wont update i am dont want to risk it maneuly and not be able to boot and have to get new bios chip. ALL help is greatly apperiacated and very welcome thanks in advance!

un oc it and see if it is stable for long periods of time. contact asus about the bad iso or see what they can do to get a new one for you. 

You can't really corrupt your BIOS by OCing -- you can always reset it by clearing the CMOS if your OC is too high. You CAN however ruin components like RAM or CPU or MoBo (chipset) if you input some settings that are a little high....

 

Anyway, do as DER said and take off the auto OC -- I know that ASUS boards are kinda crappy with RAM voltages/timings when any settings are on AUTO so that could very well be your case. If you want to OC your system I would say research it more and OC manually as then YOU know exactly what is going on should something fault. If you are comfortable with that right now just stick to stock settings IMO

 

EDIT: disregard what I said about your BIOS; I didn't read the second part of your post very carefully