Video turns off automatically coincide with starting to speak in Zoom

Hello,

It has been around a year now having this program:

I join the meeting, and I turn on the video and every thing goes well, until I unmute myself and start talking, at this moment the camera shuts down automatically and I am not able to start the camera again without leaving the meeting entirely and re-joining the meeting again.

This happens when I am not the host, and it happens usually when I join a meeting with many people, but if there is only one person (the host) and me it goes well, I can talk without the camera automatically close.

I uninstalled and downloaded zoom several times but problem still the same.

I use the built in camera in my laptop and I only have one. 

I have windows 10 - HP spectre laptop - The graphics card is updated.