my Ubuntu 15.04 crashes frequently after some time. After it crashed it reloads the desktop-manager and shows the login.
I have a Lenove Thinkpad T520 with 8 GB ram, 8 GB swap partition, Core i5 Processor and Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller.
I use Google Chrome with many tabs open very much. I'm not sure if Chrome causes Ubuntu to crash.