Site goes down at the same time every day in memory-constrained environment

[mpalmer (Matt Palmer)]

To swerve back to the original problem for a moment, do you happen to have any recollection as to when you last upgraded Docker? I’ve just tracked down a bug in Docker 17.11 which has the definite potential to cause the sorts of problems you reported. See the above post for more details and instructions on how to downgrade Docker to a working version.