Translucent stripe on Canon R8 frame

[TEQUILA]

Friends, this is the question. Did a dark transparent stripe appear at the bottom of your frame? While photographing with a shutter with a curtain yesterday, I came across such an artifact. Please note there is a stripe at the bottom of the frame. Weak, but it's there. Yesterday I met for the first time in some shots. This has never happened with an electronic shutter. Or frost at -10. Tell me, what do you know? The adapter is original. Lens EF 135mm 2L. Shutter speed 1/800, continuous shooting

[Peter]

Try different shutter speeds. Especially shortest possible.

[TEQUILA]

I came home. At home I tried short exposures. Shot in series with 1/4000. But there was no more strip. Not in any frame. What could it be? Should I be concerned about camera damage?

[p4pictures]

If it was -10C or -10F then it's below the operating temperature window of the camera. To me it looks like the shutter curtain is a little slow to clear the frame and that could be due to the cold.