Ricoh MP C2011 printer works using cups on armhf ubuntu, and then stuck "sending data to printer"

Printer: Ricoh MP C2011 (or MP C2011SP?) http://www.openprinting.org/printer/Ricoh/Ricoh-MP_C2011 View PPD file: http://www.openprinting.org/ppd-o-matic.php?driver=PDF-Ricoh&printer=Ricoh-MP_C2011&show=1 Printer Added via CUPS web interface. Print Command: $ lp -d c2011 test.pdf CUPS version: 2.1.3 CUPS installed via command: $ sudo apt install cups System: Ubuntu xenial armhf via "LinuxDeploy" app on Android. The system also has foo2zjs installed, works well with HP LaserJet P1102w. =========================================================================== The printer works fine when the CUPS Status says "Idle". After a pdf file normally printed, the status turn to Idle - "Sending data to printer." And then I do the next print, the printer prints nonsense text and blank pages. So I run $ sudo service cups restart And then printer status turn back to "Idle". And then print, and then "Sending data to printer" again. It's not a good solution that restarting CUPS before printing.