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It may be also slicer, but this seems to me as firmaware related thing or overcurrent protection in PSU.
Do you use Pronterface? If yes, please turn on Debug communication in Settings menu. Next time when you will try to print, it will write you why it stopped in the text console. If you don't see text console, then in Settings/Options/User interface set Interface mode to Standard or Compact and restart Pronterface.
Second question, did you do the PID calibration on both heatbed and extruder?
If you want to rule out the Slic3r, in Filament Settings set temperature on Extruder and Bed to 0°C. It will than use the temperatures you set in Pronterface and won't wait for heaters to reach any preset value.
And please send me PM with your email. I would like to see the whole configuration.h of your firmware.
Update: What is the real resistance of the 120x120mm heatbed? If it is around 1.0Ohm as I found somewhere on internet, then it would consume about 144W! Can your PSU deliver such power? If this is the case you have to set #define MAX_BED_POWER 128 or so (instead of 255). It will heat up much slower but should not crash when more things like extruder and motors will start running.