When I close the laptop (not turning it off) and when I open it (before or after entering my password account) I have a black screen with lines of @@@@@ appearing in a flash.
then it is opening like a fresh new restart of the OS : all the previous opened applications are gone,.

This issue is happening whenever the battery is charged or not.

sometimes it is even happening when I connect an external hard drive to it, the flash window with @@@ lines and a fresh new restart...

Do you have an idea ? how to fix this ?