I had like 8 tabs opened on my Internet. When I check the next time I go on the Internet, I only have 2 tabs opened. And this has happened a least 6 times (or more) since I got it (august, 2015). And this happens anywhere, on different WiFi networks (home, school, McDonald's etc). I guess it's not that big of a deal... but it's really annoying!
Ps. It's a galaxy s4.