Smart TVs are not actually very smart at all and apps will stop working at the drop of a hat if the tv manufacturers don't update them. This happens all the time.
I'd suggest checking the user forums for your tv to see what the error code means and also if anyone else is having the issue.
I assume that Netflix etc work fine on other devices?
all of sudden cannot connect to Netflix BBC I players etc, is there a simple solution to this?
Panasonic offer :
When connecting to the network an error, 007, appeared what can I do?