Complete shutdown when watching a programme

Kim Cavanagh

Honorable
Feb 14, 2014
1
0
10,510
Whilst watching a catch-up programme, at night, about 30 mins into prog the computer completely shuts down. This happens every night at 23.45!!
I've played programmes during the day and they play all the way through so now I'm thinking the comp seems, somehow, to have a 'turn-off' instruction (and this has only happened within the last week and a half). If anyone out there has any advice I would be really glad of it but please be aware you are dealing with someone who is not too computer literate ..... in other words I need instruction in 'plain-speak'.