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I am experiencing this same issue on ONE of my Elementary installations (but not the other). sudo apt update sudo apt upgrade reboot hasn't helped...
click 'applications' in upper left corner (command+spacebar) type 'files' and press enter (or click the highlighted 'files' icon) The icon in the...
Worth trying: Update the kernel to 4.8.x Without some sort of log telling us what's crashing or freezing, it's not obvious that this will help...