Sleep mode fault

Hi.

My new pc is having problems, when I put the pc to "sleep mode" it sleeps ok, but when I come to wake it the pc would turn itself on and off without doing anything else

Any ideas? I'm very close to swapping this motherboard back to an Asus



MY CURRENT BOARD IS:
Gigabyte x48T-DQ6

I appreciate any help on this matter
Thanks

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