RF 70-200 F4 L IS USM lens focus and shutter problems, very weird, please help!

[darina]

Yesterday I wanted to use my RF 70-200 lens with my R5 body. All settings were as usual, and yet the lens wouldn't focus. The screen displayed "manual focus", despite the fact that I double checked the switch on the lens (on AF) and camera settings (also AF). I exchanged lenses with my R7 body to see if the issue was the body or the lens. Another lens worked just fine with the R5 body, but when I connected the 70-200 to my R7, the shutter started working really oddly. It was very slow, as if the exposure time was one second and more - it was set for at least 1/125. On both bodies, my shutter speed was set on high, yet on R7 it was very slow and loud. 
What could be the issue here? Any ideas?

[Waddizzle]

What shooting mode(s) are you using?  Test both bodies using the default [AUTO] mode for each camera?  Try using other lenses. 

[Tronhard]

Hi and welcome to the forum:

What objects were you trying to focus on and what settings were you using please, mode, focus points etc.?

[shadowsports]

Greetings,

Is this a new lens?  New behavior?  Did it work previously?   Has something changed?  Has the lens been dropped, etc.  Sorry for all the questions.

[darina]

Hello! This is not a new lens or new bodies, it hasn't been dropped, it's my favourite lens. This behaviour stopped after I changed the mode from High Speed Continuous Plus to High Speed Continuous, but I'm afraid it might come up again

[ebiggs1]

First option when things go bonkers is a full reset of the camera. It almost always clesrs it up.

[shadowsports]

Greetings,

Review this section of your manual, including the "caution" section.  The lens meets the standards for H, and H+ without needing FW update. 

Canon : Product Manual : EOS R5 : Selecting the Drive Mode (start.canon)

There are certain conditions that may keep full 12 FPS from being achieved.  A weakened battery and/or battery with low charge can also affect performance. 

Start with a reset as Ernie suggests for additional troubleshooting, and confirm your battery health. 

Reference:

Lens: FW version 1.1.1 is available as of 12/22. - Note is for reference only.

Canon Support for RF70-200mm F4 L IS USM | Canon U.S.A., Inc.