The only time this ever happens on my Panasonic recorder is when the EPG is altered with things such as a series ending and a new series starting on consecutive weeks or a one week gap in programs usual because of Public Holidays. All it shows when checking the booking schedule for next scheduled time is "No Data" which means the current series is finished or there's been an amendment in the transmitted EPG data which breaks the cycle.
I always check my EPG preset record data once a week though to make sure there's no glitches like this.
Sure I understand the end of season and break in transmission.
But when the EPG shows it as "S" and you think fine this is recording, and you look at the Record list and it has no data against it, and it does not record. It becomes confusing and frustrating.
could always set it up manually