Comment # 7 on bug 955079 from Johannes Meixner

FYI:
sane-backends-1.0.27 RPM packages for openSUSE users
are now available in the openSUSE Build Service
development project "graphics" for manual download
for openSUSE Leap and openSUSE Tumbleweed from
http://download.opensuse.org/repositories/graphics/

In general see the section
"RPM packages of the 'sane-backends' scanner drivers"
at https://en.opensuse.org/SDB:Configuring_Scanners

The sane-backends version 1.0.27 release contains
in particular this change regarding USB3
for details see http://www.sane-project.org/
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 * Updated Linux USB3 workaround (see Note 3).
...
Note 3: The Linux USB3 workaround which was added
in version 1.0.25 is now disabled by default.
If you have difficulty using a scanner which previously worked,
or intermittent scanner availability, try setting the new
environment variable SANE_USB_WORKAROUND=1
before starting your frontend. 
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I assume the issue is fixed in sane-backends version 1.0.27.