Canon imageCLASS MF269dw II User Manual page 585

Is the Machine Installed in a Location Subject to Strong Wind Such as from an Air
Conditioner?
If so, adjust the air direction and volume of the air conditioner.
If that does not work, setting [Switch Paper Feed Method] to [Print Side Priority] may improve the problem.
Touch Panel Model
[Home] on the control panel
Paper Feed Method] select the paper source
5 Lines LCD Model
on the control panel
[Switch Paper Feed Method]
* When you select [Print Side Priority], the printing speed for 1-Sided printing will decrease.
Troubleshooting
[Menu] [Function Settings]
[Print Side Priority]
[Function Settings]
select the paper source
576
[Common] [Paper Feed Settings]
[Common] [Paper Feed Settings]
[Switch
[Print Side Priority]