Firmware: PKG2.166EUA

The app worked fine till day before yesterday, and since yesterday on launching the Youtube app it says:

This page display failed. ...

Is this at Sony's end or did Youtube break something ?

Also on trying to access www.youtube.com in TV's native browser, it throws a 500 Internal Server Error.

All other internet apps working fine. 

Frustrated !!! Netflix broke 2 weeks back, and now its Youtube. I hope Sony fixes this ASAP.