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If you're getting dumped to the login screen, that indicates that the entire X server is crashing and being restarted. You may want to look at the X logs in /var/log/Xorg.* and the kernel log (in /var/log/dmesg or run the dmesg command)

This could be caused by a change in the kernel, graphics drivers, or the X server. You may want to look at the package upgrade log at /var/log/dpkg for things to investigate.