Using a Gearman RepRap with Slic3r, printing from an SD card, with an uniterupted power supply (UPS), and both PLA and ABS filaments, short power outages often result in x/y-axis offsets (see image). During an outage the power is not as clear from a UPS as from a power conditioner. If both x and y axes offset the results look like Why did my print fall off its raft?. Are you experiencing these same issues? Have you solved the issue.
The image above shows an x-axis shift that occurred evenly across eight parts distributed across the bed. The filament was ABS. The parts still adhered to the bed. Note: the G-code file normally prints well. Thus, the file is not corrupt.