Color scan problem with HP LaserJet MFP on Ubuntu 18.04

My system is:

• HP LaserJet MFP m236dw
• Ubuntu 18.04
• HPLIP ver. 3.21.8

hp-scan gives gray picture up to 300 dpi with no problems.
However, in color mode "hp-scan -m color" it gives the following error:

Warming up...
Scanning...
error: SANE: Error during device I/O (code=9)
Closing device.

Doesn't matter if USB or Network connection.
I've tried all solutions I could find on the Internet.
I tried several HPLIP versions with complete cleanup&reinstall and at some point it gave me 300 dpi color picture, but after reboot it stopped working again and I failed to reproduce the conditions that caused it to work once. hp-check and hp-doctor see no problems.

Printing works OK.
Any help is appreciated....

2 Sorted by: Reset to default

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