By browser do you mean like google chrome? I don't think that is what's causing the problem. It doesn't happen all the time. But when it does it - now that I think of it - seems to be happening when there are big things happening, like sales, clearances and things like at the new year or other big event. I have a new laptop and it's doing it here, as well as on the main pc which is streamlined for games.
I don't believe it's anything on my end causing this and I can't see any of the sales or specials. Is there anything you can do?