Problem with my Phone

[Edu007]

Hello, I have a problem with my Samsung, it is that I recently updated my phone to version IU 7, and the problem that I have been experiencing is that, as you can see in the video, the screen freezes, and the first time I missed the audio that I was listening to, it repeated itself but very quickly (loop like 1/2), I need to fix my phone soon, I hope someone helps me

[Tourbillon De La Vie]

Wipe phone cache partition
• Power off the device.
• a USB-C cable to a PC or another device.
• Hold Volume Up + Side Button until Recovery Menu appears.
• Select Wipe cache partition/ Confirm Reboot system.

[Edu007]

I already did it, but sometimes the problem comes back. 

[AndrewL]

@Edu007: What action are you attempting to perform in the video, as it looks as though you are pressing and holding the Volume Down and Side buttons together. When doing so for around 10 seconds, this will perform a soft reset on the device, however simply tapping the Side button will place the phone in a locked/idle state. 

I can also see a line of pixels on the display? Is this a persistent fault, and has the phone been subjected to any physical damage?