Computer Glitch

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what really happens when while surfing with a couple of windows open, each with a number of tabs running at the same time when, suddenly, one of the windows closes and after opening a new one with the tabs you are currently visiting, a few minutes later the window that intermittently closed returns? could that just be computer glitch, such when the PC's system is already running on a very low memory or is it possible that another pc somewhere else is accessing my files? it happened to me quite a number of time and if i remember it well it would be a few days before a virus would have entered my PC or a word file would be writing a letter continuously even without my fingers on the keypad.