It sounds like you probably have already checked this, but just in case...
Can you to double-check within the Display Settings application (available via right-clicking on an empty space of your desktop), under the 'Multiple displays' section, that each monitor is set as an Extension of your desktop? (you will have to click on each monitor number to check the setting for each one).
In other words, we don't want Windows marking any of them as 'Disconnected' (Windows 10 seems to do this on its own from time to time).
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