Keyboard stops working
Both IMacs from 2013 and now the 2019 have an issue with the keyboard that stops working. I have to quit Safari and come back in to get it to work again.
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First off see > If your Apple wireless mouse, keyboard, or trackpad isn't working as expected - Apple Support
If nothing there helps and you have one of the new rechargeable keyboard?
Try plugging it into your iMac with the supplied USB cable and leave it plugged in.
Or optionally, take the keyboard (which has a 1 year warranty) into your local Apple Store to be tested and/or replaced.