Help please,  Yesterday Iwas the first time I gave been unable to connect via my Sony Bravia tTV to iBBC Player

A couple of days ago - when watching regular TV - message boxes suggesting use of alternate HD channels pop up when, for instance I am watching BBC1.  Since these appeared I am unable to connect via my Sony Bravia TV to iPlayer. All other internet connections are fine and it loads 5 on demand, Sky News, YouTube etc fine. The only fault is with iPlayer.

I have been through the Bravia systems and used Fadtory Reset and reconnected and checked my broadband  wirless network - I use Virgin Media n- all of which do not solve the problem,

When trying to load t I get a fault screen stating that there may be Netwirk issues.

Any assistance/advice would be very gratefully recieved.  Thank you.