Panasonic Viera 'Refresh' default picture settings to Dynamic

Hi

My mum has a Panasonic 32 inch Viera tv with a strange feature.

It will put on screen a message about 'auto refresh' and defaults the TV picture settings back to Dynamic (when we had set it to normal). Change it back to Normal and it will repeat after a while and change back to Dynamic.

Did a search for 'refresh' in the manual but no hits.

Has anyone come across this?

Thanks,

Grant