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My Canon T3I on occasions will not take a picture. I will snap a shot then try again giving adequate time and it will fight me on taking the picture or just not release the shutter at all no matter what I do even though I as pressing the button. At times I have to give up on it all together and use something else to get the shot. I though battery voltage and that is not it brand new batteries in it. It is about 4 1/2 yrs old still original parts. I am hoping the shutter is not dying but it seems this may be the issue. I do not currently know the count on it but it has to be up near 80k by now. I am not a professional but I do enjoy photography and this thing comes everywhere with me. Any opinions?

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    What lens(es) are you using? What is the lens(es)' minimum focus distance? What is your subject distance? – Michael C Sep 27 '16 at 9:50
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    What shooting mode is the camera in? What happens if you switch to M mode? – inkista Oct 1 '16 at 17:56
  • How do I determine the shutter count on a EOS 60D body? may be helpful for determining the shutter count. – user Dec 1 '16 at 14:42
  • Does the camera focus? It is not unusual for camera to refuse to shoot if the focus has not been achieved. – Gnudiff Nov 25 '17 at 16:40
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Do you have focus priority or shutter release priority? Do you have a filter on the lens that may effect focus? Is there a pattern to when this happens? One pattern I have seen is taking a camera from an air conditioned vehicle into a hot summer day. This can create a slight condensation on the filter which prevents the autofocus from locking in. If you have focus priority this can be an issue.

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    Also worth noting here that auto mode uses focus priority, so a lot of people may be using it without knowing anything about what "focus priority" means. – Philip Kendall♦ Oct 31 '16 at 10:28

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