c7824 WIP - Disconnects from LAN connection every day... and I need to restart

Hello, I've a camera c7824 WIP. The camera stays connected to the Internet (via LAN cable) and I can use it properly for a while, but then it disconnects from the internet and I'm not able to access to the camera anymore. I don't even find the camera with the Camera Finder app. All the other cameras (different models) stays connected, while this camera becomes unaccessible.

I need to restart the camera to get it online again.

The camera has a firmware model: 48.53.46.8 and webUI version: EN45.8.53.20.

There is a new firmware 48.53.46.9. But everytime, when I try, it fails the upgrade.

By the way, why my firmware is "48.53.46.*" while C7824WIP cameras are supposed to use "48.53.75.*" firmware?

Dear customer ,
Because of different chipest , the firwmare is different .

Have you read the first part of my post?

"Hello, I've a camera c7824 WIP. The camera stays connected to the Internet (via LAN cable) and I can use it properly for a while, but then it disconnects from the internet and I'm not able to access to the camera anymore. I don't even find the camera with the Camera Finder app. All the other cameras (different models) stays connected, while this camera becomes unaccessible.
I need to restart the camera to get it online again."

How can I fix this????

Hello??? Can you please reply to my question???