@Jelllo Most likely the superbowl ran longer than what the Guide had set. Example being if the Superbowl was scheduled for 7pm-10pm, but actually ran longer to say 10:30pm, you will be missing the last 30mins.
1. Always extend the recording time of any live event. At least an hour and if it's a long event, extend by 3 hours.
2. With the Super Bowl being a possible exception, always record the Canadian channel. With simsubs, the recording is often truncated, or sometimes not even recorded as the channel substitition takes place at the start or end of the timeslot.