KDL-40WD655

I've been using the internet apps (Home->All Apps) successfully for a long time, and the last time it worked was the evening of Friday 19 Oct. On Saturday evening (20 Oct), selecting "All Apps" caused the TV to hang and not respond to remote button presses, the only way out being to change channel which worked after 30 seconds or so. It's been like that ever since.

I can access the internet via the Netflix button, checking network connectivity results in a "Success", I can update internet content successfully, and all other computers in the house are working.

I've gone so far as to perform a System Reset back to Factory Settings, but the result is still the same.

It looks like the problem is at the Sony end of the internet. Can anyone help please?