UPDATE: This is now a recall.
Sony is pointing the finger at over half a million notebooks, claiming that a bug puts them at risk of overheating.
The problem affects some 535,000 Vaio F and C series notebooks that have been sold since January. On top of this, Sony is saying that an additional 111,000 units are susceptible to other issues. It is believed that a miscalibrated temperature sensor is to blame for the overheating.
Sony issuing a BIOS update to fix these problems, but customers do have the option of returning the notebook to Sony to carry out the work.
Japanese models affected are: VPCF119FJ/BI VPCF118FJ/W VPCF117FJ/W VPCCW29FJ/W VPCCW28FJ/P VPCCW28FJ/R VPCCW28FJ/W VPCF11AFJ VPCF11AGJ VPCF11AHJ VPCF11ZHJ VPCCW2AFJ VPCCW2AHJ.
Affected models sold outside Japan are: VPCCW25FG/B VPCCW25FG/P VPCCW25FG/W