ubuntu reboot suddenly

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Hello
I have met a strange problem. And I have costed 2 weeks to search for a solution.
I used the rcnn(https://github.com/rbgirshick/rcnn) which call caffe's library , but the computer reboot itself suddenly.
Below is my experiments infomation.
1, ubuntu 14.04
2, cuda 6.0
3, Geforce Titan black
Can anyone help me?


PS:
1, I have monitor the GPU use rate, graphic card mem, CPU use rate, memmoy, EVERYTHIN is ok except the CPU use rate is 100%
2, I have located the error code "caffe('forward', batches(j))"!!  But I don't know how to fix it.
3, I have tried to reduce the batch_size to 64, but no lucky !!