Canon EOS REBEL T3 Basic Instruction Manual page 330

Troubleshooting Guide
High-speed sync cannot be set in the <f> mode.
Under [7 Custom Functions (C.Fn ], set [2: Flash sync. speed in
Av mode] to [0: Auto] (p.218).
The camera makes a noise when it is shaken.
The built-in flash's pop-up mechanism moves slightly. This is normal.
The shutter makes two shooting sounds during Live View shooting.
If you use flash, the shutter will make two sounds each time you shoot
(p.123).
During Live View shooting and movie shooting, the E icon appears.
It indicates that the camera's internal temperature is high. If the <s>
icon is white, the still photo's image quality might deteriorate. If the
<E> icon is red, it indicates that the Live View or movie shooting will
soon be terminated automatically (p.136, 150).
Movie shooting terminates by itself.
If the card's writing speed is slow, movie shooting may stop
automatically. Use an SD Speed Class 6 "
find out the card's read/write speed, see the card manufacturer's Web
site, etc.
If a movie clip's file size reaches 4 GB or the shooting length reaches
29 min. 59 sec., the movie shooting will stop automatically.
The image flickers or horizontal stripes appear during movie
shooting.
Flickering, horizontal stripes (noise), or irregular exposures can be
caused by fluorescent light, LED bulbs, or other artificial lighting during
movie shooting. Also, changes in the exposure (brightness) or color
tone might also be recorded.
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" or faster card. To