help please

[UserSamsungAli]

My lock screen keeps on turning off for 2 seconds and then on again. Fix please? And yes I tried restarting my phone. 

[phantom2]

من شاشه الريكوفري اعمل
wipe cash partion

[UserSamsungAli]

where do I find this "screen recovery "

[phantom2]

your mobile model please

[UserSamsungAli]

s9 plus

[phantom2]

turn off your device
push volume up + Bixby +power button together for a short time
tap the screen
then from the menu select
wipe cash partion