Battersea

I have recently purchased a 43UP81006LR tv and have a problem recording scheduled recordings. Selecting the programs isnt a problem and the program is listed in the TV Scheduler as required. However when the recording starts the program being watched at the time, changes to the program that is to be recorded, if you want to then go back you have to stop the recording. This effectively means I can only watch the program that I want to record. What am I doing wrong?