window maximize is non-reversable

You can't reverse window maximize on gnome terminal. When you maximize the window then minimize, either by using the maximize/minimize window or by double clicking the title bar (intentionally or otherwise) then when you try to minimize the window it uses almost the full screen (excluding space occupied by panels). It forgets the initial size or the size eplicitly set by the user. View -> Normal size also has no effect.

Workaround: terminal -> 80x24 does work after you have minimized the window (but not before).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-terminal 3.18.3-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Jan 16 09:10:07 2017
InstallationDate: Installed on 2017-01-16 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: gnome-terminal
UpgradeStatus: No upgrade log present (probably fresh install)