new phone started to flicker?

hi everyone ♥ I've just bought a phone today, it was the last model available so it was being used as display at the fnac store. when I finished setting it up, it started to "flicker" a bit, I don't know if this is considered flickering but the screen was getting slightly darker and then brighter for a few seconds like it was loading something (idk)? now I've used it for a bit and it's not doing this anymore, but I'm afraid if this is a software problem? or is this normal? if anyone has any insight on this thank you so much!

(I'm sorry I don't have much technological knowledge).

submitted by /u/fawnsage
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