@Clive_A It seems that the problem was indeed with the power. After I plugged it into another outlet, everything went back to normal. I reorganized the electrical cables and plugged it back into the...

@Clive_A Thanks for the tips. As for dust or reflection, I don't think it could be that, because I've been recording for several weeks with the previous firmware and I've never seen this happen....

After the notification on my NVR VIGI 1004h-4P, I updated the firmware of my C340-W 2.20 camera to the new version 2.0.4 Build 241216 Rel.43399n (before I was using 2.0.3 Build 240914). Everything...