Question New desktop with odd question

[schroedel]

https://flic.kr/p/2qBoE6i

Newbie here, I recently upgraded my desktop from an old HP with Win7 to a new HP Envy TE01-5xxx with win11 Home. Also new monitor Acer 27 ED27OR FHD. My question is every once and awhile when I move mouse to wake up PC I get the screen of lines and snow (attached I hope) that will last a sec or 2. On occasion longer then go to mu sign in page. I would guess 3 out of 10 times of waking it up. Any ideas? Is it monitor or pc?
TIA
Jon