Several times now I have had timers fail to go off as scheduled. Nothing records in this case and the opportunity to record a show is lost. There does not seem to be any rhyme or reason to which shows will record and which won't. Sometimes the 921 records a show and sometimes it does not. It also does not seem to make any difference whether the show being recorded is in HD or SD. Has anyone else experinced intermittent timer failure like this? Is this a known issue with the 921? If not I am officially reporting this bug.