T5i malfunctioning

[nyttrain5150]

Hello all, while doing a google search on my issues with my T5i I found this forum. I read through the "Camera saying busy and won't take pictures" thread and decided my issues while similar isn't quite the same. I'm very hopeful someone can help me.

I shoot in manual/raw format and normally use a Rokinon 14mm lens that is 100% manual (no auto focus), the camera is also in manual focus mode.

I noticed the other night while shooting some Milky Way shots that I could not take consecutive pictures without pressing the playback button first then pressing the shutter button. The first press of the shutter button works correctly but the second press and so on does not, I found this quite odd and investigated further. While pressing the shutter button the "Q" in the lower left of the screen would highlight coinciding with the shutter button being depressed but the shutter would not activate. I then turn on the touch shutter and it worked flawlessly. I plugged in my Vello intervalometer and tried it, same result as using the shutter button itself, I have to press playback in order for the shutter to fire. I though it was a lens issue so I swapped lenses to my kit lens (18-55mm stm) and same problem, even in auto focus modes on the lens and camera. I also cleaned the lens contacts and inspected for visual damages. At this point it doesn't appear to be a lens issue. I then updated the firmware to Ver 1.1.4 & reset the setting to factory defaults all to no avail. The issues also exists in all menu functions (Auto,Av,M,Tv, etc).

While expermenting I found out that if I press the DOF button (below the lens release) between shutter button presses the shutter functions every time without failure.

I forgot to include the memory card is a Sandisk Extreme Plus 32gb

[TTMartin]

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@nyttrain5150 wrote:
I first noticed it when shooting at night but the problem exists all the time. I've since reset the setting taking care of the mentioned long exposure compensation and noise reduction out of the equation.

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When you shoot in Green Square mode, that pretty much bypasses all the settings that you can have messed up. So that pretty much rules out a settings issue. 

When you tried shooting in Green Square mode with the kit lens, the lens cap was off and the camera was pointed at something with contrast to focus on correct?

The only other thing you might try Green Square mode with the kit lens set to MF.

[nyttrain5150]

I tried in green square mode outside in sunlight where I've shot hundeds of clicks before in maunal and in AF and the problem still happens. in fact the more I "play" with it the worse the problem seems to be.

I'm amost certain it is beyond a settings issue however I was holding on to some hope. I'm really dreading beginning the process with Canon but appears I may have no choice. I do appreciate your suggestion as I am using them as a double check list of things I may have overlooked.