Blurred area at 360 R

Hello, has anyone encountered the problem of blurry area at photo|video when shooting 360 with the R camera? I use it for about a month, a week later this area appeared, while there were no any extreme situations or underwater, just a tourist travel shooting. Of course the lenses are clean, but the area is always the same. I am attaching a sample snapshot. It was ok at the first week of usage.