I just recently purchased a Google Android 7" MIB Tablet. When I first got it 2 weeks ago it worked fine. Now when I try to get on Yahoo, or anything on internet it just stops. The little blue bar goes about 3/4 to 7/8 across and just freezes. It is very flustrating. How do I get it to work again, like it did when new. I am using Mcdonalds wi-fi link and I show connected with good signal strength.