If your Stream+ missed a scheduled recording, then there was likely a tuner conflict. A 'conflict' is when there are more than 2 programs scheduled to record, or, overlap at the beginning or end of another program scheduled to record.
To check for 'Conflicts', press the 'DVR' button on your remote. Navigate down to 'Schedule'. Navigate to the right, to 'Full Schedule' and select it. You will now be able to see all of the programs that are scheduled to record, and also the programs that were scheduled, but have a 'Conflict'. You can now reschedule and/or cancel recordings.
Please note; ‘Live Channels’ is a Google implementation, in collaboration with Channel Master. Channel Master is not responsible for ‘Live Channels’ functions or issues. All Guide data, logos, and images are provided by Google. Any Guide data issues & questions, and bugs should be reported to Google.