I found one core would crash before the other, I also found my cores had slightly different temps. If it does this on Small FFT settings, then you need more Vcore or a slightly lower bus speed.
Treat them as seperate CPUs, and you can only go as fast as the slowest one.
I'm running mine at 4.37Ghz, but at 4.5Ghz I get Core 1 erroring.
I was able to do 4Ghz with a bump in Vcore but everything else auto like you.
You're running kinda hot though, at 4.37 @ 1.52V I don't get over 65/63C and normally at 100% load the cores are 62/60C). I'm using a Coolermaster Hyper NS520 (not the best but works well).