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Solution
If the maximum burst is lower than the normal number, and the camera stops continuous shooting in mid-course, check the [High ISO speed noise reduction] for custom function setting.
If [High ISO speed noise reduction] is set to [Strong], the number of continuous shots (maximum burst) will be lower. To reset the maximum burst to normal, select either [Standard], [Low], or [Disable] for [High ISO speed noise reduction].
Caution
When the [High ISO speed noise reduction] setting is enabled, more time is required to process noise reduction. As a result, it will take longer to temporarily save data in the storage space, and the camera is more likely to be interrupted during continuous shooting.
1. To change the [High ISO speed noise reduction] setting, display the menu screen and choose [C.Fn II: Image] on the [ 
2. Select the [High ISO speed noise reduct'n (Custom Function No.2)]. The [High ISO speed noise reduct'n] screen will appear, select either [0: Standard], [1: Low], or [3: Disable] for [High ISO speed noise reduction].
For more information, please refer to the camera's instruction manual.
Caution
With [2:Strong], the maximum burst for continuous shooting will greatly decrease. If either [0:Standard], [1:Low], or [3:Disable] is selected, the maximum burst will rarely decrease.