5D IV Shutter Release Locking Up?

[Choreo]

I have had my 5D Mk IV just over a year, but have still been using my older 7D most work last year. I started back practicing with my 5D4 last month in the house and noticed that from time to time the shutter button would just stop working? I tried the following things and ALL of them seemed to work at different times:

Turning camera off then back on

Remove - reinsert memory card

Remove -reinsert battery tray

Switch lenses

Since then I bought new Canon batteries and new memory card to eliminate those vaiables.

Yesterday I had my first commercial shoot with th 5D4 and it failed me. I was shooting a commercial interior and after 5 shots, the shutter button did nothing - no AF activation or shutter release. I could still access the menu on the back of screen, just the shutter button would do nothing. 

Did I just get a lemon (that is now out of warranty)?

[kvbarkley]

Is it focusing?

Did you try another lens?

Have you tried in manual focus mode?

[Choreo]

No, the shutter button does nothing when pressed - no focus, no beep, no shutter realeae - nothing.

Yes tried several L-Lenses.

Swithing lens to manual does nothing.

[kvbarkley]

Do you have an N3-type remote shutter release you can try?

[Choreo]

Yes. I will try that when it locks up again.

[RobertTheFat]

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@kvbarkley wrote:

Is it focusing?

Did you try another lens?

Have you tried in manual focus mode?

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That was my first thought too. The symptom reflects the behavior you get if you're positioned at less than the MFD.

At least that was true with earlier Canon DSLRs. I don't think I've ever been in that situation with my 5D4.

[Choreo]

Well, when it locked up yesterday, I was using my 16-35 L lens trying to photograph the exterior of a building about 40 yards away. Switched to my old 7D with a 10-22 EF-S - worked fine.

[tmc784]

Did you try to disable mirror lock up and clear all camera settings back to default ?

[Choreo]

Mirror Lock-up is off, but I have not reset to defaults. As few changes as I have made to the defaults, if that causes a problem then I am not sure if I could ever rely on customizing settings?

Looks like I will probably be sending the camera in to Canon tomorrow, but it will probably be like every car I have owned that screwed up where the problem would disappear within 100 yarrds of a Dealership!

[Choreo]

Shipped the camera to Canon a couple days ago; hopefully, they will find something? Unfortunately, the camera was working fine again before I packed it up (typical). Even with the Canon UPS discount, UPS wanted $147 to ship it back with insurance! Amazing how B&H could ship it to me brand new and insured for "free" - it's good to be B&H!