My Smart TV Is: 22" H5600 Series 5 Smart Full HD LED TV; Model numberUE22H5600AK, purchased in 2016.
For the last 4 or 5 months it has developed 2 distinct issues:
a) switches off and back on non stop. Yesterday was even worse it would switch off [during main ITV programme/ roof aerial source] and stay off until I used remote to switch back on
b) streaming: no matter the source [BBC iPlayer, All 4, ITV hub] picture freezes and either remains frozen, or switches back on on air Freeview programme. Smart TV is in different room from broadband router but only some 4m away, with signal transmitted through very thin partition wall. FYI: laptop placed in same location as TV has no problem streaming any programme with no interruption.