Tv keeps switching off and on

[Yt106]

My SAMSUNG 55" smart tv keeps switching off then back on , if i try choosing a channel,  turn volume up , infact anything and it switches off then comes back on .

Ive tried switch off at the wall but no affect at all. 

Any suggestions?

[Yt106]

If it helps on box it says

Curved UHD TV

6 SERIES MU6500

NEW 2017