Created attachment 157190 [details] it's the moment when kwin crash, I succeed to take this before the reset of the session kwin unexpectedly crashes and restarts the session closing all the programs I have running. Usually browser Opera, Spotify, libreoffice writer and wireshark. There isn't a specific moment when it's happen, could be few second after I start or two hours late. In this section happen two hours later and now in the meantime I write this. I thought (but it's to verify) a security bug, an attack to my system.
*** This bug has been marked as a duplicate of bug 467002 ***