This's on Windows 10. Not tried to repro on any other OS.
1 Open several charts on a multi-monitor setup
2 Let them run for several minutes on live market data
3 Minimize one or two
4 Let run for several more minutes
5 Click NT8 icon on the taskbar, hover over a thumbnail to restore
6 Click the thumbnail, often only a ding sounds, window not restored.
Running live market data seems to be the key ingredient.
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