In my Missed Recordings , I got the message "this show could not be recorded because it conflicted with a High Priority recording". That message is wrong for 2 reasons: I only had one show set to record at that time; and there is no setting on my DVR which allows me to choose "High Priority".
If the program that failed to record was the only scheduled program, a failure to record due to a schedule conflict would have been an anomalous glitch. Something went wrong for an undetermined reason that caused the scheduler to process a schedule conflict. If it occurs frequently, you might have a defective cable box.
The "High Priority recording" was another program scheduled for the same time period (or in your case, the scheduler performed as though there was another program scheduled) that had a higher priority than the program that failed to record. Ten programs scheduled to be recorded on various dates and times would be prioritized from 1 to 10. If you have a Record 2 DVR and the #8, #9 and #10 priority programs have a scheduling conflict, #8 and #9 would record and #10 would fail. You would see the "High Priority recording" message in Missed Recordings for #10 even though neither #8 nor #9 would be considered "High Priority" when compared to the priority of all scheduled recordings.
Here is a Forum post with instructions for changing Contour 2 recording priority.
How to change Contour 1 recording priority
Press the DVR List button.
Press the down arrow to Series Manager.
Select the program from the displayed list for the series priority to be changed.
Press the B button to Modify Series Priority.
Follow on screen instructions.