You could try out ...
- different browsers at home e.g. IE8, IE9, Chrome, Firefox, Safari, Opera
- clearing your cache.
Make a note of any ads you see immediately before the problem occurs.
Are any other websites affected? Or any other applications on your PC misbehaving?
Recently when I try to post in the forum I find there is about a 50/50 chance when I hit submit that the page will simply freeze, and I will have to reload and reenter my post. It seems to happen no matter when computer I use or what connection I log in with. It has become so common that I highlight my posts and do a control-c before submitting them, as I will likely have to paste the text back into the empty form at least once before I can get it to go. Do other people find this to the be case. It is extremely annoying, but I run into it both at home and when I check at at work on a break, so I don't think its my system.