If the scanner was working fine with the Pi before, I would suspect the USB cable or power supply. Try a different power supply and cables. The Raspberry Pi 3B+ can supply 1.2 amps from its USB ports which is sufficient for 2 bus powered devices. A powered USB hub can be used if you need to connect more bus powered devices to the Pi.
this post was submitted on 22 Mar 2024
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You were right. It was the bloody usb cable powering the pi. I had switched that to a shorter one for less cable, but switching back it works again. Thank you
Probably also check the power settings in the config file: https://kalitut.com/increase-usb-current-limit-raspberry-pi/
Out of curiosity, how did you solve that software wise? I was planning to do the same thing with my old MFP. Are you just using CUPS and SANE?
Using cups for the printer and a sane web ui (scanservjs) for the scanner
I'll look into that, thank you!