Hello,
I own an Acer Aspire 5742 for one year now. (Intel i3 380 m @2.53GHz, 3GB RAM DDR3, Intel HD Graphics)
Not long time ago my notebook started to suddenly shut down while more stressful applications were running on it. I have noticed that the temperature in idle is high and unstable per core. In idle mode Core 0 oscilates between 40 and 55 oC
while Core 1 is between 38 and 52 oC. Also the temperature difference between the two CPU cores most of the times is higher than 5 oC which should not happen. I mostly used the notebook for programming and school research and most of the times used it on a cooling pad. The notebook's ventilation is clear, no dust blocking the ventilation areas or the fans.
[edited for privacy]