Have some strange thing going on where every time I boot up the miner I have to delete the .bin file, otherwise it does the "stopped working" windows things.
During test of v1.4 after a few seconds from compiling kernel happened also to me. Maybe it depends on greedly OC / UV or too aggressive intensity. Now I have found a stable configuration (probably not the best) and average hashrate has improved compared to v.1.1 (from 0.5 Mh to 1 Mh per card ).