d-sub error

Hello. So for about a week, my monitor at random times during the day (no more than three times) will lose signal and will display the "D-SUB No Signal" error. At the same time, there is sound from whatever I'm watching on the monitor, but after 2-3 seconds it will lag and the only way to fix...

Currently I have 2 of the same model LG monitors, One is connected with HDMI while the other is connected by a VGA to Display port cable, both of them were working perfectly but suddenly the one connected by VGA - Display port stopped working and I've tried a lot of things as well as removing...