ScanJet 4400c 150 dpi only grey, other DPI settings work

Hello! When using my HP 4400c with xsane and 150 dpi, the outcome is just a grey/bright blue picture, not real content of the page. Other DPI settings like 300 produce a normal scan.

I also noticed that the scanner moved forward, stops, then moves a bit backwards and then forward again. This happens multiple times until the page is scanned. If needed, I can record that on video.

ii  libsane-common      1.3.0-1         all          API library for scanners -- documentation and support files
ii  libsane-hpaio:amd64 3.22.10+dfsg0-5 amd64        HP SANE backend for multi-function peripherals
ii  libsane1:amd64      1.3.0-1         amd64        API library for scanners
ii  sane                1.0.14-18       amd64        scanner graphical frontends
un  sane-airscan        <keine>         <keine>      (keine Beschreibung vorhanden)
ii  sane-utils          1.3.0-1         amd64        API library for scanners -- utilities
ii  xsane               0.999-12+b2     amd64        featureful graphical frontend for SANE (Scanner Access Now Easy)
ii  xsane-common        0.999-12        all          xsane architecture independent files

This was the outcome when I scanned a newspaper with 150dpi.

Please tell me if you need additional information. If you need, I can provide remote access to a Linux machine where I connect this scanner.

kind regards Marco

Edit to add: 1200dpi in colour terminates early on this model so it is not possible to get a full scan in this mode.