No, it is a random event. most of the time I'm fine. I noticed it first when trying to empty the waste bin, and getting locked out. After reboot, things were fine. Then I realised that eventually folders cannot be accessed, too.
One theory of mine is that some background process may be running. I searched for one suspect, but found none. That does not mean that I know all the things running in the background on my system.
I scanned via AntiVirus software, AdAware, Spybot S&D, A-squared, and cleaned the registry. Security is handled restrictive over here.
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If you feel nuts, consult an expert.
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