Camera Lens Issue

Last weekend my Canon EF 24-70mm f/2.8L II USM lens developed a fault whereby my DSLR camera would show an “Err 01”, “Communication between the camera and lens is faulty.” error when trying to take a picture. Stopping down the aperture to f/2.8 prevented it from happening, and with that aperture I could still take pictures with the lens - and it only happened with this particular lens, other lenses were still okay - so it seems something has broken with it.

I haven’t recently knocked or treated it in an obvious way that might have suddenly caused this - 5 years ago I did drop it though, but it’s been fine immediately since then, but within the last six months I have noticed it doesn’t always focus as well as it used to, but I’m not sure whether that would be connected to what in this instance seems like an electronic issue vs something more like focus slippage.

Cleaning the lens contacts didn’t resolve the issue, so I’ve had to send it off to Canon Service in the hope it can be fixed pretty quickly, which is a bit annoying as it’s my main lens.