More users report PS3 Firmware 2.42 issues
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As you can see from this thread on the US PS Blog, people are complaining about disc-read errors after installing the latest PS3 Firmware, version 2.42.
Posters are casting aspersions on the validity of some of the complaints, but this comes after a previous report of similar issues at the weekend.
Trawl through that thread and see for yourself, assuming you've finished punching brick walls for the evening.