EOS R5 Settings changing on their own

[ChrisPollard]

Ive discovered to my angst that while Im out shooting birds with my R5, in AV mode, MY ISO SETTINGS, EXP COMP AND F Stop settings change .I usually shoot in auto ISO and just as Im about to take the shot I notice that the settings have changed to the max !!!, please help its driving me barmy !!!, never had this issue with my old trusted 7D Mii.

Many Thanks

Chris

[shadowsports]

Greetings,

Please help us better understand your issue.  What FW version and lens are you seeing this behavior with?

[ChrisPollard]

Pardon my ignorance but what is FW?, I shoot primarily with the new 100-500 mm lens

[shadowsports]

Hi,

FW = firmware.

As of today v1.8.1 is the latest.

[rs-eos]

Are you sure you're in Av mode and not full auto?

May be worthwhile to reset the camera's settings.

[ChrisPollard]

Certainly in AV mode ,all I shoot in.I will see how to update the firmware as previously suggested.Thanks anyway

[shadowsports]

@chris,

The firmware update is not a recommended solution.  It was a question, so we have a better understanding of your environment.  

Please start with @RS-EOS (Ricky's) suggestion.  Reset main and custom camera settings. Retest and report back please.

Later*** At some point, I'd recommend updating to FW v1.7 or 1.8.1.  The cumulative updates are worthwhile and add significant performance improvements to the camera.  

[ChrisPollard]

Thanks Rick, Ive altered some of the custom settings slightly and Ive downloaded the latest FW, strangly enough it never happened this weekend,and I got some awesome shots on the beach here in KSA.Could there be a connection with the heat in this enviroment and could the fading battery power effect the camera?Crab Plover KSA

[snaphappy19]

Did the issue of the aperture changing resolve itself fully? I’m still having problems with my R5 randomly changing the aperture and I shoot on full manual, so I’m curious. 

[Waddizzle]

Is Safety Shift enabled?