Question Weird problems with my monitor

Jun 6, 2020
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So hello , i had this issue for quite some time but i was too lazy to solve it . So my monitor sometimes just closes , black screen for like 5 seconds then back to normal or has some weird lines and pixelated like the old TVs for 2 seconds , black screen then normal. I have a rx 580 with an HDMI-VGA adaptor because the monitor only has a VGA port. I think its the adaptor at fault but i`m not sure . Help