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Asteroid

Sometimes get a black screen when I unlock my phone

I use my fingerprint to unlock my Samsung Note 9, however sometimes when I'm looking at the lockscreen and I place my finger on the scanner, you see it unlock, then the screen goes black.  If I lock the phone and try again it generally works. It just seems very random.

 

Anyone else had the same issue?

Is it something to worry about?

Can I stop it happening?