Same here, Ubuntu 16.04.4. If I close the lid to put my DELL E6230 into
sleep, upon opening the lid and bringing it out of sleep, it says
'Switch to greeter' message, same as OP.

Last system updates I actioned was installing security updates for the
Wayland Compositor (Binary utilities & dev files). It also installed
updates for Avahi (client library, common data files, common library &
GObject library).

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