I have been using IGO 8 and Garmin on my GPS set. For the past two days I have not been able to lock on to my GPS positions. On the screen, it shows up the satellites as yellow and red dot but none has been able to turn on to green.

Previously I could have 6-7 green dots even in my house near to the window in under 10 seconds! Now for the past 2 days, I was not able to get a single green dots.

Is there a problem with the external satellites signal or is it just my GPS set. If the problem is my set, is it a hardware or software problem?