TM switches itself off once-a-week...

As the subject line says... it starts again after I switch the slider back to ON in Time Machine Preferences.
My TM volume is an external USB-disk that's left on 24/7, also when sleeping my Mac Mini overnight, and is still there when it awakens. The switching off is not related to sleeping/awakening, I believe, as the last successful B/U is usually several hours later.
Is TM switched off by some weekly cron-like process, I wonder?

I had this problem for awhile, but it has stopped since I moved the airport to a different location. It was connected with the Apple extension chord to a Monster surge protector and close to a bookcase with metal bars. I disconnected the extension chord and plugged the AE directly into the surge protector (and about two feet away from the bookcase). The freezing stopped after that. I really think that the AE is quite sensitive to certain situations. It is not as strong as the Linksys access point that I was using as it gives me a range of about twenty feet before the connection begins to drop.
Anyway, I don't know if that helps, but I hope it does.
Toshiba Satelite A-10   Windows XP  
Toshiba Satelite A-10   Windows XP  

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