MacBook Pro 15 mid 2015 freezes?

Question

macOS

MacBook 15 mid 2015: i7 2.5 GHz; 512GB; 16GB; AMD Radeon R9 M370X. Mac bought three months ago. Everything would be fine, but I began to notice periodic freezes, mostly it is noticed in safari, when watching videos on YouTube and less often when watching movies through the player. Hangups are both short-term and tightly. At what sometimes the mouse moves, sometimes it doesn’t, it doesn’t react to anything other than a reboot. When you close the lid, the apple continues to glow. When it hangs for a long time, the touchpad stops clicking. Freezes are wildly random. It happens 5 times a day, and it happens that everything is fine for a week. I don’t want to take it under warranty yet, because the diagnosis will probably be very long. I hope for your help, because before that I used computers on Windows and I don’t understand much about poppies.
With Yosemite, this may not have been observed, but I could be wrong, because I just started using it and could miss it. Now the latest version of El Capitan is installed.

Answer 1

check ssd.

Answer 2

Right now I turned on the video in 4k and in every possible way began to load the video card, at the same time I monitored at what moments the discrete one works, and at what moments the integrated one. And when switching between desktops, a horizontal bar appeared in the middle of the screen. Also noticed mouse artifacts after swiping over the video area. So I sin on the video card or on the driver.