Well, aside you possibly installing some kind of software or plug-ins that could have caused you to experience this, i would also love to mention that issues like this are still normal and can affect any site, big or small, most especially when there is some kind of work going on in the backend; speculations like this can arise if the team didn't beforehand; announce that an update or upgrade will be happening.

Anyways, just trying to let you know that such issue can also be from freebitco's end actually, since it states that your browser and your internet connection are OK, it's probably a server issue, but I believe it's already fixed long ago.

OK, thanks very much for the update man.