The first episode in the new season of "The Sopranos" ended in a classic cliffhanger moment, with Tony on the floor after being shot by his uncle Junior. But some viewers who recorded the show on their TiVo digital video recorders to watch later might not know how close Tony came to being whacked.

Because of a software glitch in some machines, TiVo customers have been discovering over the last few months that some of the shows they had set to record were cut off before the programs ended.

"I lost the last 15 minutes of 'Lost,' as well as 'C.S.I.,' " said Monica Sharma, a marketing solutions manager in Piscataway, N.J. "Regrettably, the big things happened at the end."

The first notice of the problem came in November, when a few befuddled TiVo users posted complaints on TiVo's Web site. Customers also wrote about the glitch more recently at tivocommunity.com, an independent site for TiVo aficionados. A TiVo employee who monitors the sites posted a response there saying the company was on the case.