Logout right after login

The system was working fine, Using the normal login, I started a campaign yesterday what worked fine. Later in the day, when I login, I get to the dashboard but when I click on a button, it logs me out.

I’ve updated hosting core, uploaded phplist last version and now it does this

https://www.youtube.com/watch?v=3sp13M9wLT8

Any idea of what i can do?

The link says that the video is unavailable. I suspect that this may be related to the token included in the URL, or the session data. For security purposes, most links include an authentication token. If somehow the wrong token is being used, or an old token, then the page will redirect to login.

Try logging in via private or incognito mode in your browser so that the session and cookie data is not available to phpList.