Im still troubleshooting this
Ive taken the card out and had a close look at it. There is a slim heatsink at the rear that is supposed to cool the MOSFETS, but upon closer inspection there is a very thin gap between the heatsink and the MOSFETS thereby it wont be much help at all if its not touching. I take it they wont be cooled properly and Im thinking could this be causing the crashes with excess heat. Any suggestions on this?