Lightroom export causing Mac to shut down

I am a photographer and have been using Lightroom for years. I recently completed the new update which I have been neglecting for a while. Now I am having trouble exporting more than 5 photos at a time as my computer will shut down. Is this a problem with lightroom or my computer/hard drive? 

Hardware Overview:

  Model Name: MacBook Pro

  Model Identifier: MacBookPro9,2

  Processor Name: Dual-Core Intel Core i7

  Processor Speed: 2.9 GHz

  Number of Processors: 1

  Total Number of Cores: 2

  L2 Cache (per Core): 256 KB

  L3 Cache: 4 MB

  Memory: 4 GB

  Boot ROM Version: 233.0.0.0.0

  SMC Version (system): 2.2f44

  Hardware UUID: 6EA03625-06CD-5FA3-801D-F02D296BE32D