Hi.
This is really weird. But also annoying.
The GFX card output on my A4000 has areas, vertical bars of maybe 2 cm width, every 6 or 7 cm, where the output is slightly blurred so that text is harder to read and is not sharp. There is not a different color or so, it's just that's is not sharp in those areas.
I have this on two different GFX cards. So it might not be the GFX card.
What else could that be?
Manfred