Missing Guide Data

Anyone else been noticing missing guide data lately? For example: last week I was missing CBS Sunday Morning on both CBS affiliates I get--the night before I rebooted, forced a connection, and by morning the program was still missing, just a 1.5 hour hole in the schedule. Now I've just noticed that there was no 10 pm Saturday night show on NBC, and tomorrow the F1 pre- and post-race shows are now gone (and they had been in the TDL). I've also been noticing a day of data missing from several channels a few days in advance--that usually clears up in time.