FWIW I got a refurb V37 from ebay since you can’t get them new anymore and it had screwed up scan lines no matter what I did. Changing the settings only made them worse. I even copied the exact settings that working scanners had to no avail. I’ve seen at least 2 or 3 others on this forum with the same problems and best anyone can tell it’s a hardware issue. I never found a fix
www.elitefourum.com/t/im-about-to-lose-my-mind-help-on-v37-settings/28112/1
Plenty of people have had 100% success with the V37, but there’s also several of us who haven’t had them work out