Canon EOS REBEL T6i Instruction Manual page 377

The image flickers or horizontal stripes appear during
movie shooting.
Flickering, horizontal stripes (noise), or irregular exposures can be
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caused by fluorescent lighting, LED lighting, or other light sources
during movie shooting. Also, changes in the exposure (brightness) or
color tone may be recorded. In the <a> mode, a slow shutter speed
may reduce the problem.
Wi-Fi
Wi-Fi cannot be set.
If the camera is connected to a computer, printer, GPS receiver, TV
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set, or other device with a cable, Wi-Fi cannot be set ([51: Wi-Fi/NFC]
will be grayed out). Disconnect the cable before changing any settings.
For details, refer to the Wi-Fi/NFC Function Instruction Manual.

Operation Problems
During touch screen operations, the beeper suddenly
sounds softer.
Check if your finger is blocking the speaker (p.26).

Display Problems
The menu screen shows fewer tabs and options.
In Basic Zone modes and in movie shooting mode, certain tabs and

menu options are not displayed. Set the shooting mode to a Creative
Zone mode (p.53).
Troubleshooting Guide
377