I've checked the power settings and all are configured to get max performance, my colleagues have
the same laptop and are also using Windows 8.1 and have no problems with the display resetting.
The only difference is that my system was upgraded from Win 8 pro to Windows 8.1 pro preview to
windows 8.1 pro (through store update).
Using the system with just a single display I don't experience the problem, only when using an extra monitor
it is like the monitor gets disconnected (cable removed from connector). Sometimes this happens several times in a row.
Best,
Martin