Chosen Solution
After disassembly, a white part remains which fell from the case… And I cannot find its location at all… :( And I don’t know what it is for (part of sort of switch?). Could you guide me to replace it? Many thanks!
Vio & Antho M&P looks like you may have some connectivity issue. That is your camera’s WiFi antenna Here is how to reinstall it
That curved end wire appears to be a microswitch actuating arm. If so, look for a button that no longer feels like it is doing anything.