We are new to the site and we are having problems with the lessons freezing right in the middle of an exercise. It freezes to the point that I can't restart my computer i have to completely unplug it and plug it back in and reboot. This is very time consuming. Is this an issue that is fixable? Perhaps there is an update I need to do for my computer? Or is it my internet connection? It doesn't happen with every lesson. But it does happen at some point every time we log on and start using the site.