Hi I have a year old V3-571G. In the past month I have had two random shutdowns, at least that is what they semm to be. Both times occured while I was cruising the internet. What happens is the screen will randomnly go black and then about 5 seconds latter the power button will no longer be lit. However the Fan keeps running. I can take out the battery or push the power button for a shutdown and upon reboot it says windows was improperly shut down would you like to do safe boot and the other normal options.
Looking around the forums I found this topic
http://community.acer.com/t5/Notebooks-Netbooks/Acer-Aspire-R7-Randomly-Shuts-Itself-Off-A-Power-Shortage-Issue/m-p/130757#U130757
and this one
http://community.acer.com/t5/Ultra-Thin/New-Acer-aspire-V3-571g-random-shutdowns/m-p/55747#M2179
However the first one is about moving the laptop around which is not the case for me, it occurs while the laptop is simply sitting still. The second one is not the same issue as it seems to still be running.