This problem hit me on a xenial install with HWE and linux-generic- hwe-16.04 with generic kernels 4.8.0-52 and 4.8.0-53. Problem is alleviated by using the mainline kernel 4.12-rc2.
Please note: I cannot use the vers=3.0 workaround as described above because one of my servers is running Windows Server 2003 which, as I understand, still uses the older SMB1 protocol. This problem happened on a users workstation and due to the freezing problem with the desktop and file manager, her system was unusable for about 2-3 days. It took me a little while to pin-point the problem to a complete cifs freeze which was occurring within 5-45 minutes of logging on. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1687273 Title: Shared folder randomly not mounted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cifs-utils/+bug/1687273/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs