A vertical line on the monitor, how does it go away?

I ordered the AOC C24G1 monitor from Media Markt a few days ago.

I sat on the PS4 as usual and played with the monitor for the first time, no line.

A day later there was a red line on my monitor I unplugged all cables and restarted everything he was still there a short time later he was suddenly gone.

To date he has come every now and then.

It was already back, I connected my PS4 to the TV for testing, no line. Immediately afterwards again on the monitor, I see the line again. Funny.

Can anyone help me please?

If it is not the cable I would send it back directly. You have 14 days right of return anyway.

Yes, bring the monitor back.