For the past couple of months or so the computer freezes intermittently and the screen goes black. After ~30 seconds of HD activity the screen comes back up and all is well - until the next time. Have made several clean installs of the latest driver for the NVIDIA Geforce GT 740 graphics card, but the issue remains. Only software components installed are the driver, Geforce Experience & PhysX. I cannot recall exactly when the issue started and whether or not it began after a Windows update or software installation - as I recall the only recent software installed was Acronis True Image 2018 (previous versions have not caused any issues). Among other checks the Samsung SSD checks out OK with Samsung Magician as does the memory with Memtest (FWIW). I am thinking that a solution to the problem may be to change the graphics card for an ATI powered version. Any thoughts/suggestions or relevant experience appreciated.