This sounds like an issue with your update to 1903. I agree with stumped that the first "attack" should be to uninstall calibre and then reinstall. Uninstalling calibre will leave your library intact. Also, make sure you are using a very recent release of calibre.
I've been running calibre the recent releases of calibre on 1903 for several months. My old Dell XPS desktop has been for about 4 months and my Surface Go has for about a month and neither have had any issues.
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