Security is important, but the Minecraft Launcher is taking it a bit too seriously with having to re-enter one's account details. Had to that three times over the last couple of days. @MojangSupport
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Replying to @Bloo_dev
I'm sorry you're having trouble! It's currently a temporary issue that we're hoping to get fixed soon. This page has more info help.minecraft.net/hc/en-us/…. Thanks! ^AS

Oct 21, 2019 · 3:51 PM UTC

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Replying to @MojangSupport
Thank you, but this doesn't really solve our issue. Logging on works fine, but the launcher is either obsessed with security or has dementia as it requires one to re-enter one's account details VERY frequently. It didn't do that before.
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Replying to @MojangSupport
This is not the problem we are experiencing, we can login just fine, but we are logged out after a day or two.