yes and no.
My S3 648250 still gets S03 error from time to time but it has a cable card and tuning adapter.
When the t/a is left disconnected (usb) for a few hours GC completes, then the service connection completes.
S03 is gone and guide data is current.
Last week it had an S03 error and the last GC completion was 2 days old.
Disconnected the t/a and by the next morning S03 was gone and guide data updated.
But a day later I checked sys info. Service connection failed: S03 error.
The weird thing is GC completion was up to date.
I forced a connection, checked a while later to see it had failed again.
Disconnected the t/a and as always a few hours later all was up to date.
