It seems that the ACPI IRQ routing may be the cause. Can you try the kernel parameter:
acpi=noirq -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/997767 Title: 10ec:8139 Network connection rtl8139 lost after some hours of inactivity and comes up again on user interaction To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/997767/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
