I have tried two different browsers (Mozilla Firefox and Google Chrome), and I was trying to play from different locations (i.e. networks). The result was the same. My computer runs Windows 7 on 64 architecture, and I firstly experimented this some time ago, without changing anything on the computer, then I have renounced playing. Now I have tried to restart and the unpleasant incidents manifested again.
My question is if there are other people experimenting the same annoying behavior, or it is something wrong with my computer.
Thanks in advance!