this has been going on for a while now with my Gigabyte M28U 28'' 144hz 3840 x 2160 gaming monitor. what it will do is in the middle of gaming, the screen will go black (for about 5 seconds) and then it changes resolution to 2560 x 1600. the native resolution obviously is 2160p (4k). itll affect my gameplay especially while playing competitive fps games. so ill have to go into settings and change the resolution back to normal. and the monitor will do this all the time and i have no idea why. itll do it to me while playing on my ps5 but the resolution doesnt change but the screen goes black, then itll show me 3840 x 2160p on the screen. i have done everything possible as far as going into nvidia controls etc... i had an pc issue before where id get blue screen errors all the time. and at the time i was trying to make my C Drive a 500gb instead of a 120gb SSD 2.5'' but i somehow messed everything up and i was stuck in my bios screen and couldn't go to my desktop so i had to start my pc from scratch with NEW EVERYTHING. so i thought that maybe fixed my monitor issue but it did not. it did fix all other issues ive had. sorry bout the rant. but i am unsure what to do. the Gigabyte monitor is a Freesync monitor with an IPS panel 1 ms response time also. i do have an Nvidia RTX 3090 Ti so there should be no reasons why i cant play on 4k.. i feel i should sell this monitor and go for a Gsync monitor instead, i don't know if i should go back to 1440P or stick with 2160P for gaming but i absolutely love the 4K experience.