I have ben having some issues with a Windows 8 machine as it locks when idle for a certain amount of time. The idle time is currently set to 5 minutes. When I go into the power options and change the all the timings it makes no difference.
What I have done so far:
1) Restored the default settings for the plans.
2) Changed all the power options for the power plans
3) Looked in the local group policy and couldn't find any changes to make in there (maybe missed something????)
4) The screen saver is disabled and also set so that it doesn't lock if the screen saver comes on