My MY21 cameras were all replaced under warranty about one month ago. Intermittent failures. If you have this issue make sure you take pictures of the issue. The dealer used the photos to get Porsche to approve the replacements.
I've had this issue. Brought it up with the dealer and showed a picture. Was told they have to have a video of Porsche would deny the claim. For me it only seems to happen after driving in the rain though, and haven't done that in a while.