After all this time, I still have this happening to me. Thank you, this beats uninstalling and reinstalling Origin.
I wrote a batch file for it (yes, I am that old)...
Make a text file on your desktop and rename it to CleanOrigin.bat (or anything your heart desires.
Right-click and choose Edit.
Paste the following text into the text file, save and run it. (at your own risk)
md %temp%\LocalContent
robocopy %ProgramData%\Origin\LocalContent\ %temp%\LocalContent\ *.* /MIR /ZB
del %ProgramData%\Origin\*.* /F /Q /S
rmdir %ProgramData%\Origin\*.* /S /Q
del %appdata%\Origin\*.* /F /Q /S
rmdir %appdata%\Origin\*.* /Q /S
del %userprofile%\appdata\local\origin\*.* /F /S /Q
rmdir %userprofile%\appdata\local\origin\*.* /Q /S
##move backed up data back
md %ProgramData%\Origin\LocalContent
robocopy %temp%\LocalContent %programdata%\Origin\LocalContent *.* /ZB /S