For the last couple of weeks, (maybe more) a number of series that I have set to record are not recording. At times I look to at the next week upcoming, scan the days, and see all the shows listed, ready to record. (same set for the last 10 months) When that day comes around, instead of the usual red dot indicating that the show is going to be recorder, it has the red circle, with the line through it. All these shows are new episodes, and not repeats.
Shows that have been a problem: Daily Show with Jon Stewart, Late show with Craig Ferguson, Stephen Colbert. These three have been consistent problems, and some other shows are intermittent.