sudden screen flickering for first time,got afraid if it’s serious?

Hi friends.
I left my phone in the house with WiFi on and it was getting some notification updates on samsung apps automatically,when I holded it.
But at that moment background image which was set by program Wallpaper Changer was flickering for like 5-10 seconds then black screen and after that I got picture.
I got so scared,now I assume it’s display issue damage or perfectly norma,if yes what could cause this?
Phone was not used it was standing on the table from early morning.
Phone wasn’t held near heat nor anything just on my laptop which was off.
The battery is at 38 %.

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