[Updated] PS3 Firmware 4.40 Released
The Japanese PS Blog lists the following changes in version 4.40
Improved System Stability
Adds Sony RC-S380 NFC Reader Compatability
The PS3 firmware has been updated to version 4.40 and it is mandatory to update if you want to play online.
Sony haven't released any details of the update but the previous firmware update had broken Play TV, so hopefully this update will at least address that.