This is a brand new T5i with 18-135mm STM I got yesterday and I've been having problems with the camera locking up intermittently, but consistently, with or without an SD card in it.
Example, with no SD card, I can turn it on in Photo mode, take a sample picture which it shows on the display, no problem, just says there's no SD card. Now, if I place it in video mode, I notice that the camera will not auto focus. When I try to turn it off, the display sticks for a while, the shutter won't close. Eventually sometimes it will close and the sensor cleaning message will stay on for a long time. I've also gotten a message several times that the lens wasn't attached, when it clearly was.
I've replaced the battery several times, reseated the lens, etc. Still having problems. Please help?? I'm sorely dissapointed!
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I had the same issue and just contacted support. Were you able to get your camera back to working order? I bought my camera around the same time you made this post but wasn't using computerized lenses so I didn't notice. Not sure how long it's ben like that. I really hope this is a small issue. 🙂