I recently bought a samsung LE26R87BDX and its been fine until I started fine tuning the picture,
When I adjust the colour tone etc it holds it for half an hour then resets ,
can anyone give me an idea whats wrong.

it's in "Shop" mode! it needs to be changed to "Home" I think you need to press & hold the Menu button for 3 seconds & select Home.

The shop mode is designed to return it to the normal "Shop" settings after 30 min. after customers have been messing with the settings.

We recommend setting the TV to Home mode for the best picture in your home environment.
Shop mode is only intended for use in retail environments.
If the unit is accidentally set to Shop mode and you want to return to Dynamic (Home) mode,
press the Volume button and then hold down the MENU button for five seconds on the side
panel of the TV.

Nice one cheers guys il try it out tonight.