My 32PFL7406K has been switching itself off and on again, multiple time per evening. I mostly use it to play content off of an AppleTV connected to one of the HDMI ports. Last week I've hooked the TV up to the internets, and let it updates its firmware to version Q5551-0.14.99.0, but that hasn't fixed the problem -- it seems it's gotten worse (restarts more often).
This behaviour did not occor previously, and the software on the AppleTV hasn't been updated since after I've gotten the TV, so I'm quite sure the problem lies in the TV's software.
I have reset the TV's software to 'factory defaults'.