Hi AndiB,
Welcome to the Community!
Sorry to hear your having pixilation issues.
I've run a check on your equipment and I can see and issue with the signal as well as a few other errors.
I'd like to send a technician to take a look at this for you. I've sent you a private message (purple envelope at the top right of your screen) so I can arrange this.
Look forward to hearing from you! 
Josh