I have a desktop Vostro 3668 with an AMD R9 360 OEM GPU. At times, when I left my system idle, it often kept freezing/reboot when I got back and pressed a key. I tried almost anything possible like uninstaling intel rapid storage, updating HD firmware, system BIOS, drivers, power options etc and the problem remained.... .... until I decided to set the option for the monitor to be always on! For now everything seems to be working ok! So, unless there is a problem with the graphics card (that otherwise works fine), what else could be wrong? Also, is there a video BIOS update that I could try (nothing shows up on the dell web page)?