System Thread Exception Not Handled. iAstorA.sys

Hi, When my windows 8.1 pro goes to sleep it turns itself off & I get the message in the title. I have done diagnostics & it confirmed as per the title & recommendations, which I carried out - ie: run anti virus, update drivers & BIOS but after 45min the computer is suppose to go to sleep but shuts down & I still get the blue screen. Can anyone advise how I can fix this issue. Computer is only 2months old! Model: XPS 2720 Thanks Mike