Multiple & Strange Symptoms

Mac OS X Version 10.6.8 on iMac.
Symptoms:
1. Both itunes media downloads and general software updates are being reversed - happens only sometimes. Example: Daily Show almost completely finished downloading, but I come back to the computer later and not only is it not downloaded, but iTunes store says 'Download' as if I had never pressed it in the first place.
2. Partial Safari history suddenly disappears at the same time as #1, ie websites I know I visited are no longer listed in history.
3. Finder is opening on its own.
I do not have Time Machine set up so my original hypothesis that the computer is somehow resetting itself to a previous time seems false.
Any clue?
I'm concerned that my computer has a bug of some kind.

You need a backup, either Time Machine or a clone. I'll ask the hosts to relocate your post to the iiTunes for Mac community.

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    C
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    Hi, I've seen some occasional flakiness with the USB ports on my QS 2001. I believe that the USB ports just don't provide enough juice to run many peripherals off, so my suggestion would be to make sure that you use powered hubs for anything more than a keyboard, and if you use a keyboard with a port installed (Kensington's Keyboard-in-a-Box is one such), hang only one more device off of it.
    Occasionally heat damage can be irreversible, and it sounds like you're experiencing some of the symptoms here as well. Just for grins, have you tried running the machines with the case open? The battery is also a symptom of all kinds of mischief. I'd replace that it in just one computer to see if it made a difference.
    HTH,
    ~FifthWheel

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