Just had a windows update yesterday, not sure if the events are connected but turn off display went from my setting of 30 minutes to 10 minutes and sleep never went to 30 minutes. These I believe are the defaults.
Did this happen to anyone else after yesterdays update?
Windows 10: Power settings mysteriously changed. 
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New 09 Aug 2017 #1
Power settings mysteriously changed.
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New 09 Aug 2017 #2
Hi, which update was that? It always helps to quote the number- people are on different builds getting different updates at different times.
Have a look in the News section where there is a thread per update.
(E.g. CTRL F or F3, search the page for part of your update number - one way to find a thread)
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New 09 Aug 2017 #3
Cumulative Update KB4034674 Windows 10 v1703 Build 15063.540 is what was installed yesterday. Looking in the News section there is no mention of power settings. I also installed Avira Speedup wonder if that affected some settings, quickly uninstalled it as I learned it was mainly a startup optimizer and junk cleaner. Strange.
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New 09 Aug 2017 #4
Hi Banger
I'm guessing it is either your previous Avira Speedup software app that changed your power settings or a software app such as 'System Mechanic' or 'Advanced System Care' if you have either of them installed.
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