Time glitch on laptop!

[Pequena Estrela]

Okay so this happened a few hours ago and I wonder if anyone can explain this!

I was working on my laptop. I then had to make a phone call, which took me away from the laptop as I used the house phone for the call. I returned to the laptop, which was of course still on, and started to move the mouse. Suddenly the screen went funny and the control panel appeared, the whole screen froze - and then the control panel time showed a time that was not my local time!

To be precise, I'm in the time zone that is currently GMT+1, which is the time zone for London, Dublin, Lisbon. When this happened, the control panel time showed a time four hours earlier. Four hours before my local time makes it the time zone for BRT, which is Brasília, São Paulo and Rio de Janeiro.

I immediately looked at the internet time as shown at the bottom of the screen. It was showing the correct time.

The screen then crashed for a moment and then was back to normal.

Now, I know a laptop screen can freeze and all that, but it's never shown a wrong time before! And I wonder why the control panel came on and why it showed the time as being 4 hours earlier, but the internet clock showed the correct time! The control panel can only take the time from the time the laptop is set to, and that's set to my local time. And it can't even be that the laptop found something stuffed away in its memory because it was once set to the timezone of a country that is ahead of my local time, because I used it there. It was never set to Brazilian time! So if anything, it could have reset itself to the timezone I was in years ago, but that would have been a few hours in advance of my local time - not behind!

Is someone trying to tell me something? What's going on here? I'm a bit freaked out because this has never happened before!