This simple fix I found online worked for me:
Start> in the run box type. Services.msc
Scroll down to Windows Image Acquisition (WIA)
Right click, select Properties
Check that Startup type is set to Automatic
Click Log On Tab
Check that Local System account , and Allow service to interact with desktop is checked. Hit apply.
Click Recovery...Click on window next to First Failure, Scroll to Restart the Service. Hit apply.
This got MF Toolbox to work and stay working even after a reboot. Only issue is Windows Fax Scan no longer works, but I can use MF Toolbox.
Hope it helps!