Infant mortality of silicone will usually occur within the first 24 hours of burn-in.
I would check with ASUS about this before proceeding. Open the case and make sure nothing has become dislodged or a cable is not touching something it shouldn't be.
Hmmm,..you stuck with the 380W supply that came with the Sonata. I wonder,..should be enough,..but maybe borderline. I replaced my Sonata's PS with the 480W TruPower.